[Bug 1642386] Re: At least one invalid signature was encountered.

Seth Arnold 1642386 at bugs.launchpad.net
Wed Nov 16 23:24:31 UTC 2016


sarnold at hunt:/var/lib/apt$ sudo mv lists lists.old
sarnold at hunt:/var/lib/apt$ sudo apt-get update
Get:1 http://mirrors.kernel.org/ubuntu xenial InRelease [247 kB]
Get:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease [95.7 kB]                                         
Get:3 http://mirrors.kernel.org/ubuntu xenial-security InRelease [94.5 kB]                                        
Ign:4 http://mirrors.kernel.org/ubuntu precise InRelease                                                          
Get:5 http://mirrors.kernel.org/ubuntu precise-updates InRelease [55.7 kB]                                        
Get:6 http://mirrors.kernel.org/ubuntu precise-security InRelease [55.7 kB]                                       
Get:7 http://mirrors.kernel.org/ubuntu precise-proposed InRelease [55.7 kB]                                       
Ign:8 http://mirrors.kernel.org/ubuntu trusty InRelease                                                           
Get:9 http://mirrors.kernel.org/ubuntu trusty-updates InRelease [65.9 kB]                                         
Get:10 http://mirrors.kernel.org/ubuntu trusty-security InRelease [65.9 kB]                                       
Get:11 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease [65.9 kB]                                       
Get:12 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease [247 kB]                                        
Get:13 http://mirrors.kernel.org/ubuntu yakkety InRelease [247 kB]                                                
Get:14 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease [94.5 kB]                                       
Get:15 http://mirrors.kernel.org/ubuntu yakkety-security InRelease [93.3 kB]                                      
Get:16 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease [95.7 kB]                                      
Get:17 http://mirrors.kernel.org/ubuntu zesty InRelease [247 kB]                                                  
Ign:1 http://mirrors.kernel.org/ubuntu xenial InRelease                                                           
Get:18 http://security.debian.org jessie/updates InRelease [63.1 kB]                                              
Get:19 http://mirrors.kernel.org/ubuntu zesty-updates InRelease [92.1 kB]                                         
Get:20 http://mirrors.kernel.org/ubuntu zesty-security InRelease [92.2 kB]                                        
Get:21 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease [95.6 kB]                                        
Get:22 http://mirrors.kernel.org/ubuntu precise Release [49.6 kB]                                                 
Get:23 http://mirrors.kernel.org/ubuntu trusty Release [58.5 kB]                                                  
Get:24 http://mirrors.kernel.org/ubuntu xenial/main Sources [868 kB]                                              
Ign:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease                                                   
Get:25 http://mirrors.kernel.org/ubuntu xenial/restricted Sources [4,808 B]                                       
Get:26 http://mirrors.kernel.org/ubuntu xenial/universe Sources [7,728 kB]                                        
Ign:3 http://mirrors.kernel.org/ubuntu xenial-security InRelease                                                  
Get:27 http://security.debian.org wheezy/updates InRelease [40.6 kB]                                              
Get:28 http://ftp.debian.org/debian unstable InRelease [219 kB]                                                   
Get:29 http://security.ubuntu.com/ubuntu xenial-security InRelease [94.5 kB]                                      
Ign:30 http://archive.canonical.com/ubuntu precise InRelease                                                      
Get:31 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease [20.9 kB]        
Ign:5 http://mirrors.kernel.org/ubuntu precise-updates InRelease                                                  
Ign:6 http://mirrors.kernel.org/ubuntu precise-security InRelease                                                 
Ign:7 http://mirrors.kernel.org/ubuntu precise-proposed InRelease                                                 
Ign:32 http://archive.canonical.com/ubuntu trusty InRelease                                                       
Ign:9 http://mirrors.kernel.org/ubuntu trusty-updates InRelease                                                   
Ign:10 http://mirrors.kernel.org/ubuntu trusty-security InRelease                                                 
Get:33 http://mirrors.kernel.org/ubuntu xenial/multiverse Sources [179 kB]                                        
Get:34 http://mirrors.kernel.org/ubuntu xenial/main amd64 Packages [1,201 kB]                                     
Get:35 http://archive.canonical.com/ubuntu xenial InRelease [11.5 kB]                                             
Ign:11 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease                                                 
Get:36 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease [16.0 kB]                                 
Get:37 http://mirrors.kernel.org/ubuntu xenial/main i386 Packages [1,196 kB]                                      
Ign:12 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease                                                 
Get:38 http://mirrors.kernel.org/ubuntu xenial/main Translation-en [568 kB]                                       
Get:39 http://mirrors.kernel.org/ubuntu xenial/restricted amd64 Packages [8,344 B]                                
Get:40 http://mirrors.kernel.org/ubuntu xenial/restricted i386 Packages [8,684 B]                                 
Get:41 http://mirrors.kernel.org/ubuntu xenial/restricted Translation-en [2,908 B]                                
Get:42 http://mirrors.kernel.org/ubuntu xenial/universe amd64 Packages [7,532 kB]                                 
Get:43 http://archive.canonical.com/ubuntu yakkety InRelease [11.5 kB]                                            
Ign:13 http://mirrors.kernel.org/ubuntu yakkety InRelease                                                         
Ign:14 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease                                                 
Ign:15 http://mirrors.kernel.org/ubuntu yakkety-security InRelease                                                
Get:44 http://archive.canonical.com/ubuntu zesty InRelease [11.4 kB]                                              
Get:45 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease [23.9 kB]       
Ign:16 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease                                                
Get:46 http://mirrors.kernel.org/ubuntu xenial/universe i386 Packages [7,512 kB]                                  
Ign:17 http://mirrors.kernel.org/ubuntu zesty InRelease                                                           
Get:47 http://archive.canonical.com/ubuntu precise Release [8,180 B]                                              
Ign:19 http://mirrors.kernel.org/ubuntu zesty-updates InRelease                                                   
Ign:20 http://mirrors.kernel.org/ubuntu zesty-security InRelease                                                  
Ign:21 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease                                                  
Get:48 http://mirrors.kernel.org/ubuntu xenial/universe Translation-en [4,354 kB]                                 
Get:49 http://archive.canonical.com/ubuntu trusty Release [9,359 B]                                               
Get:50 http://ftp.debian.org/debian testing InRelease [172 kB]                                                    
Ign:18 http://security.debian.org jessie/updates InRelease                                                        
Get:51 http://security.debian.org jessie/updates/main Sources [168 kB]                                            
Ign:27 http://security.debian.org wheezy/updates InRelease                                                        
Get:52 http://mirrors.kernel.org/ubuntu xenial/multiverse amd64 Packages [144 kB]                                 
Get:53 http://mirrors.kernel.org/ubuntu xenial/multiverse i386 Packages [140 kB]                                  
Get:54 http://mirrors.kernel.org/ubuntu xenial/multiverse Translation-en [106 kB]                                 
Ign:31 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease                  
Get:55 http://mirrors.kernel.org/ubuntu precise Release.gpg [198 B]                                               
Get:56 http://mirrors.kernel.org/ubuntu trusty Release.gpg [933 B]                                                
Get:57 http://mirrors.kernel.org/ubuntu xenial-updates/main Sources [203 kB]                                      
Get:58 http://archive.canonical.com/ubuntu precise Release.gpg [198 B]                                            
Get:59 http://mirrors.kernel.org/ubuntu xenial-updates/restricted Sources [1,804 B]                               
Get:60 http://mirrors.kernel.org/ubuntu xenial-updates/universe Sources [109 kB]                                  
Get:61 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse Sources [3,224 B]                               
Get:62 http://mirrors.kernel.org/ubuntu xenial-updates/main amd64 Packages [419 kB]                               
Get:63 http://mirrors.kernel.org/ubuntu xenial-updates/main i386 Packages [414 kB]                                
Get:64 http://mirrors.kernel.org/ubuntu xenial-updates/main Translation-en [161 kB]                               
Get:65 http://mirrors.kernel.org/ubuntu xenial-updates/restricted amd64 Packages [6,576 B]                        
Get:66 http://mirrors.kernel.org/ubuntu xenial-updates/restricted i386 Packages [6,528 B]                         
Get:67 http://mirrors.kernel.org/ubuntu xenial-updates/restricted Translation-en [2,016 B]                        
Ign:29 http://security.ubuntu.com/ubuntu xenial-security InRelease                                                
Get:68 http://mirrors.kernel.org/ubuntu xenial-updates/universe amd64 Packages [359 kB]                           
Get:69 http://mirrors.kernel.org/ubuntu xenial-updates/universe i386 Packages [355 kB]                            
Get:70 http://mirrors.kernel.org/ubuntu xenial-updates/universe Translation-en [130 kB]                           
Get:71 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse amd64 Packages [7,048 B]                        
Get:72 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse i386 Packages [5,852 B]                         
Get:73 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse Translation-en [2,868 B]                        
Get:74 http://mirrors.kernel.org/ubuntu xenial-security/main Sources [45.5 kB]                                    
Get:75 http://mirrors.kernel.org/ubuntu xenial-security/restricted Sources [1,804 B]                              
Get:76 http://mirrors.kernel.org/ubuntu xenial-security/universe Sources [12.7 kB]                                
Get:77 http://mirrors.kernel.org/ubuntu xenial-security/multiverse Sources [728 B]                                
Get:78 http://mirrors.kernel.org/ubuntu xenial-security/main amd64 Packages [163 kB]                              
Ign:35 http://archive.canonical.com/ubuntu xenial InRelease                                                       
Get:79 http://mirrors.kernel.org/ubuntu xenial-security/main i386 Packages [159 kB]                               
Get:80 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid/main Sources [110 kB]      
Get:81 http://security.debian.org jessie/updates/contrib Sources [1,439 B]                                        
Get:82 http://security.debian.org wheezy/updates/main Sources [293 kB]                                            
Get:83 http://mirrors.kernel.org/ubuntu xenial-security/main Translation-en [67.8 kB]                             
Get:84 http://archive.canonical.com/ubuntu trusty Release.gpg [933 B]                                             
Get:85 http://mirrors.kernel.org/ubuntu xenial-security/restricted amd64 Packages [6,576 B]                       
Get:86 http://mirrors.kernel.org/ubuntu xenial-security/restricted i386 Packages [6,528 B]                        
Get:87 http://mirrors.kernel.org/ubuntu xenial-security/restricted Translation-en [2,016 B]                       
Get:88 http://mirrors.kernel.org/ubuntu xenial-security/universe amd64 Packages [52.8 kB]                         
Get:89 http://mirrors.kernel.org/ubuntu xenial-security/universe i386 Packages [52.7 kB]                          
Get:90 http://mirrors.kernel.org/ubuntu xenial-security/universe Translation-en [32.6 kB]                         
Ign:43 http://archive.canonical.com/ubuntu yakkety InRelease                                                      
Get:91 http://mirrors.kernel.org/ubuntu xenial-security/multiverse amd64 Packages [2,764 B]                       
Get:92 http://security.ubuntu.com/ubuntu xenial-security/main Sources [45.5 kB]                                   
Get:93 http://mirrors.kernel.org/ubuntu xenial-security/multiverse i386 Packages [2,928 B]                        
Get:94 http://mirrors.kernel.org/ubuntu xenial-security/multiverse Translation-en [1,124 B]                       
Get:95 http://mirrors.kernel.org/ubuntu precise-updates/main Sources [499 kB]                                     
Ign:36 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease                                           
Get:96 http://mirrors.kernel.org/ubuntu precise-updates/restricted Sources [8,840 B]                              
Get:97 http://mirrors.kernel.org/ubuntu precise-updates/universe Sources [132 kB]                                 
Get:98 http://mirrors.kernel.org/ubuntu precise-updates/multiverse Sources [10.5 kB]                              
Get:99 http://mirrors.kernel.org/ubuntu precise-security/main Sources [144 kB]                                    
Get:100 http://mirrors.kernel.org/ubuntu precise-security/restricted Sources [4,623 B]                            
Get:101 http://mirrors.kernel.org/ubuntu precise-security/universe Sources [53.7 kB]                              
Get:102 http://mirrors.kernel.org/ubuntu precise-security/multiverse Sources [3,044 B]                            
Get:103 http://mirrors.kernel.org/ubuntu precise-proposed/main Sources [6,747 B]                                  
Get:104 http://mirrors.kernel.org/ubuntu precise-proposed/restricted Sources [774 B]                              
Get:105 http://mirrors.kernel.org/ubuntu trusty-updates/main Sources [384 kB]                                     
Get:106 http://mirrors.kernel.org/ubuntu trusty-updates/restricted Sources [5,888 B]                              
Get:107 http://mirrors.kernel.org/ubuntu trusty-updates/universe Sources [169 kB]                                 
Get:108 http://mirrors.kernel.org/ubuntu trusty-updates/multiverse Sources [7,522 B]                              
Get:109 http://mirrors.kernel.org/ubuntu trusty-security/main Sources [120 kB]                                    
Get:110 http://mirrors.kernel.org/ubuntu trusty-security/restricted Sources [4,613 B]                             
Get:111 http://mirrors.kernel.org/ubuntu trusty-security/universe Sources [45.1 kB]                               
Get:112 http://mirrors.kernel.org/ubuntu trusty-security/multiverse Sources [3,207 B]                             
Get:113 http://mirrors.kernel.org/ubuntu trusty-proposed/main Sources [122 kB]                                    
Get:114 http://mirrors.kernel.org/ubuntu trusty-proposed/universe Sources [16.6 kB]                               
Get:115 http://mirrors.kernel.org/ubuntu xenial-proposed/main Sources [90.6 kB]                                   
Ign:44 http://archive.canonical.com/ubuntu zesty InRelease                                                        
Get:116 http://mirrors.kernel.org/ubuntu xenial-proposed/universe Sources [35.2 kB]                               
Get:117 http://archive.canonical.com/ubuntu xenial/partner Sources [2,236 B]                                      
Get:118 http://mirrors.kernel.org/ubuntu xenial-proposed/multiverse Sources [900 B]                               
Get:119 http://mirrors.kernel.org/ubuntu yakkety/main Sources [903 kB]                                            
Ign:45 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease                 
Ign:120 http://ftp.debian.org/debian jessie InRelease                                                             
Get:121 http://security.ubuntu.com/ubuntu xenial-security/restricted Sources [1,804 B]                            
Get:122 http://security.ubuntu.com/ubuntu xenial-security/universe Sources [12.7 kB]                              
Get:123 http://security.ubuntu.com/ubuntu xenial-security/multiverse Sources [728 B]                              
Get:124 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages [163 kB]                            
Get:125 http://mirrors.kernel.org/ubuntu yakkety/restricted Sources [5,376 B]                                     
Get:126 http://mirrors.kernel.org/ubuntu yakkety/universe Sources [8,044 kB]                                      
Ign:28 http://ftp.debian.org/debian unstable InRelease                                                            
Ign:55 http://mirrors.kernel.org/ubuntu precise Release.gpg                                                       
Get:127 http://archive.canonical.com/ubuntu yakkety/partner Sources [2,252 B]                                     
Get:128 http://archive.canonical.com/ubuntu zesty/partner Sources [1,772 B]                                       
Get:129 http://ftp.debian.org/debian jessie-updates InRelease [145 kB]                                            
Ign:56 http://mirrors.kernel.org/ubuntu trusty Release.gpg                                                        
Get:130 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages [159 kB]                             
Ign:58 http://archive.canonical.com/ubuntu precise Release.gpg                                                    
Get:131 http://mirrors.kernel.org/ubuntu yakkety/multiverse Sources [181 kB]                                      
Ign:84 http://archive.canonical.com/ubuntu trusty Release.gpg                                                     
Get:132 http://mirrors.kernel.org/ubuntu yakkety-updates/main Sources [27.3 kB]                                   
Get:133 http://mirrors.kernel.org/ubuntu yakkety-updates/universe Sources [11.4 kB]                               
Get:134 http://mirrors.kernel.org/ubuntu yakkety-updates/multiverse Sources [724 B]                               
Get:135 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en [67.8 kB]                           
Ign:50 http://ftp.debian.org/debian testing InRelease                                                             
Get:136 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages [6,576 B]                     
Get:137 http://security.ubuntu.com/ubuntu xenial-security/restricted i386 Packages [6,528 B]                      
Get:138 http://security.ubuntu.com/ubuntu xenial-security/restricted Translation-en [2,016 B]                     
Get:139 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages [52.8 kB]                       
Get:140 http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages [52.7 kB]                        
Get:141 http://security.ubuntu.com/ubuntu xenial-security/universe Translation-en [32.6 kB]                       
Get:142 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages [2,764 B]                     
Get:143 http://mirrors.kernel.org/ubuntu yakkety-security/main Sources [13.7 kB]                                  
Get:144 http://mirrors.kernel.org/ubuntu yakkety-security/universe Sources [3,404 B]                              
Get:145 http://mirrors.kernel.org/ubuntu yakkety-security/multiverse Sources [724 B]                              
Get:146 http://archive.canonical.com/ubuntu precise/partner Sources [5,733 B]                                     
Get:147 http://security.ubuntu.com/ubuntu xenial-security/multiverse i386 Packages [2,928 B]                      
Get:148 http://mirrors.kernel.org/ubuntu yakkety-proposed/main Sources [21.4 kB]                                  
Get:149 http://mirrors.kernel.org/ubuntu yakkety-proposed/universe Sources [8,324 B]                              
Get:150 http://mirrors.kernel.org/ubuntu zesty/main Sources [909 kB]                                              
Get:151 http://mirrors.kernel.org/ubuntu zesty/restricted Sources [5,380 B]                                       
Get:152 http://mirrors.kernel.org/ubuntu zesty/universe Sources [8,248 kB]                                        
Get:153 http://archive.canonical.com/ubuntu trusty/partner Sources [10.0 kB]                                      
Get:154 http://security.ubuntu.com/ubuntu xenial-security/multiverse Translation-en [1,124 B]                     
Ign:129 http://ftp.debian.org/debian jessie-updates InRelease                                                     
Get:155 http://mirrors.kernel.org/ubuntu zesty/multiverse Sources [185 kB]                                      
Get:156 http://mirrors.kernel.org/ubuntu zesty-proposed/main Sources [44.9 kB]                    
Get:157 http://mirrors.kernel.org/ubuntu zesty-proposed/universe Sources [317 kB]                        
Get:158 http://mirrors.kernel.org/ubuntu zesty-proposed/multiverse Sources [6,136 B]                   
Get:159 http://mirrors.kernel.org/ubuntu precise/main Sources [934 kB]                             
Get:160 http://mirrors.kernel.org/ubuntu precise/restricted Sources [5,470 B]                         
Get:161 http://mirrors.kernel.org/ubuntu precise/universe Sources [5,019 kB]                
Ign:162 http://ftp.debian.org/debian wheezy InRelease                                                   
Get:163 http://mirrors.kernel.org/ubuntu precise/multiverse Sources [155 kB]                                    
Get:164 http://mirrors.kernel.org/ubuntu trusty/main Sources [1,064 kB]                                      
Get:165 http://mirrors.kernel.org/ubuntu trusty/restricted Sources [5,433 B]                                  
Get:166 http://mirrors.kernel.org/ubuntu trusty/universe Sources [6,399 kB]                                    
Get:167 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid/main Sources [13.3 kB]                         
Get:168 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial/main Sources [92.0 kB]
Get:169 http://ftp.debian.org/debian wheezy-updates InRelease [157 kB]                                            
Get:170 http://mirrors.kernel.org/ubuntu trusty/multiverse Sources [174 kB]                                       
Ign:169 http://ftp.debian.org/debian wheezy-updates InRelease                                                     
Get:171 http://ftp.debian.org/debian jessie Release [148 kB]                                                  
Get:172 http://ftp.debian.org/debian unstable/main Sources [7,214 kB]
Get:173 http://ftp.debian.org/debian unstable/non-free Sources [85.4 kB]                                          
Get:174 http://ftp.debian.org/debian testing/main Sources [6,571 kB]                                              
Get:175 http://ftp.debian.org/debian testing/non-free Sources [80.2 kB]                                           
Get:176 http://ftp.debian.org/debian jessie-updates/main Sources [15.4 kB]                                        
Get:177 http://ftp.debian.org/debian jessie-updates/non-free Sources [920 B]                                      
Get:178 http://ftp.debian.org/debian wheezy Release [191 kB]                                                      
Get:179 http://ftp.debian.org/debian wheezy-updates/main Sources [5,505 B]                                        
Get:180 http://ftp.debian.org/debian wheezy-updates/non-free Sources [929 B]                                      
Get:181 http://ftp.debian.org/debian jessie Release.gpg [2,373 B]                                                 
Ign:181 http://ftp.debian.org/debian jessie Release.gpg                                                           
Get:182 http://ftp.debian.org/debian wheezy Release.gpg [2,373 B]                                                 
Ign:182 http://ftp.debian.org/debian wheezy Release.gpg                                                           
Get:183 http://ftp.debian.org/debian jessie/main Sources [7,059 kB]                                               
Get:184 http://ftp.debian.org/debian jessie/contrib Sources [50.8 kB]                                             
Get:185 http://ftp.debian.org/debian jessie/non-free Sources [99.0 kB]                                            
Get:186 http://ftp.debian.org/debian wheezy/main Sources [5,993 kB]                                               
Get:187 http://ftp.debian.org/debian wheezy/contrib Sources [47.7 kB]                                             
Get:188 http://ftp.debian.org/debian wheezy/non-free Sources [93.4 kB]                                            
Fetched 101 MB in 15s (6,675 kB/s)                                                                                
Reading package lists... Done
W: GPG error: http://mirrors.kernel.org/ubuntu xenial InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu xenial-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu xenial-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu precise-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu precise-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu precise-proposed InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise-proposed InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty-proposed InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty-proposed InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu xenial-proposed InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial-proposed InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty-proposed InRelease: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty-proposed InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://security.debian.org jessie/updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://security.debian.org jessie/updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://security.debian.org wheezy/updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://security.debian.org wheezy/updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease: At least one invalid signature was encountered.
W: The repository 'http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://security.ubuntu.com/ubuntu xenial-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu xenial InRelease: At least one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu yakkety InRelease: At least one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu yakkety InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease: At least one invalid signature was encountered.
W: The repository 'http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu zesty InRelease: At least one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu zesty InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease: At least one invalid signature was encountered.
W: The repository 'http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian unstable InRelease: At least one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian unstable InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu precise Release: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty Release: At least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu precise Release: At least one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu precise Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu trusty Release: At least one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu trusty Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian testing InRelease: At least one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian testing InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian jessie-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian jessie-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian wheezy-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian wheezy-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian jessie Release: At least one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian jessie Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ftp.debian.org/debian wheezy Release: At least one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian wheezy Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

-- 
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https://bugs.launchpad.net/bugs/1642386

Title:
  At least one invalid signature was encountered.

Status in apt package in Ubuntu:
  Incomplete

Bug description:
  Hello, a recent apt update appears to have broken apt entirely.

  A coworker reported seeing troubles: http://paste.ubuntu.com/23487135/

  To test, I upgraded my laptop then immediately re-ran apt-get update
  && apt-get -u dist-upgrade:

  sarnold at hunt:~/Downloads$ sudo apt-get update && sudo apt-get -u dist-upgrade
  Hit:1 http://mirrors.kernel.org/ubuntu xenial InRelease
  Hit:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease                                                   
  Hit:3 http://mirrors.kernel.org/ubuntu xenial-security InRelease                                                  
  Ign:4 http://mirrors.kernel.org/ubuntu precise InRelease                                                          
  Get:5 http://mirrors.kernel.org/ubuntu precise-updates InRelease [55.7 kB]                                        
  Get:6 http://mirrors.kernel.org/ubuntu precise-security InRelease [55.7 kB]                                       
  Get:7 http://mirrors.kernel.org/ubuntu precise-proposed InRelease [55.7 kB]                                       
  Ign:8 http://mirrors.kernel.org/ubuntu trusty InRelease                                                           
  Get:9 http://mirrors.kernel.org/ubuntu trusty-updates InRelease [65.9 kB]                                         
  Hit:10 http://mirrors.kernel.org/ubuntu trusty-security InRelease                                                 
  Get:11 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease [65.9 kB]                                       
  Get:12 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease [247 kB]                                        
  Err:1 http://mirrors.kernel.org/ubuntu xenial InRelease                                                           
    At least one invalid signature was encountered.
  Hit:13 http://security.debian.org jessie/updates InRelease                                                        
  Err:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease                                                   
    At least one invalid signature was encountered.
  Get:14 http://mirrors.kernel.org/ubuntu yakkety InRelease [247 kB]                                                
  Err:3 http://mirrors.kernel.org/ubuntu xenial-security InRelease                                                  
    At least one invalid signature was encountered.
  Hit:15 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease                                                 
  Get:16 http://mirrors.kernel.org/ubuntu yakkety-security InRelease [93.3 kB]                                      
  Hit:17 http://security.debian.org wheezy/updates InRelease                                                        
  Get:18 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease [95.7 kB]                                      
  Hit:19 http://mirrors.kernel.org/ubuntu zesty InRelease                                                           
  Hit:20 http://mirrors.kernel.org/ubuntu zesty-updates InRelease                                                   
  Hit:21 http://mirrors.kernel.org/ubuntu zesty-security InRelease                                                  
  Err:5 http://mirrors.kernel.org/ubuntu precise-updates InRelease                                                  
    At least one invalid signature was encountered.
  Hit:22 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease                                                  
  Hit:23 http://mirrors.kernel.org/ubuntu precise Release                                                           
  Hit:24 http://mirrors.kernel.org/ubuntu trusty Release                                                            
  Ign:25 http://archive.canonical.com/ubuntu precise InRelease                                                      
  Hit:26 http://security.ubuntu.com/ubuntu xenial-security InRelease                                                
  Hit:27 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease
  Hit:28 http://ftp.debian.org/debian unstable InRelease                                         
  Err:6 http://mirrors.kernel.org/ubuntu precise-security InRelease        
    At least one invalid signature was encountered.
  Err:7 http://mirrors.kernel.org/ubuntu precise-proposed InRelease                              
    At least one invalid signature was encountered.
  Err:9 http://mirrors.kernel.org/ubuntu trusty-updates InRelease                                
    At least one invalid signature was encountered.
  Ign:29 http://archive.canonical.com/ubuntu trusty InRelease                                     
  Hit:30 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease                         
  Hit:31 http://ftp.debian.org/debian testing InRelease                     
  Err:10 http://mirrors.kernel.org/ubuntu trusty-security InRelease         
    At least one invalid signature was encountered.
  Err:11 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease                               
    At least one invalid signature was encountered.
  Err:13 http://security.debian.org jessie/updates InRelease                                      
    At least one invalid signature was encountered.
  Hit:32 http://archive.canonical.com/ubuntu xenial InRelease                                     
  Hit:33 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease
  Ign:34 http://ftp.debian.org/debian jessie InRelease                     
  Err:12 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease        
    At least one invalid signature was encountered.
  Err:14 http://mirrors.kernel.org/ubuntu yakkety InRelease                
    At least one invalid signature was encountered.
  Hit:35 http://archive.canonical.com/ubuntu yakkety InRelease              
  Err:15 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease         
    At least one invalid signature was encountered.
  Hit:36 http://ftp.debian.org/debian jessie-updates InRelease              
  Err:16 http://mirrors.kernel.org/ubuntu yakkety-security InRelease        
    At least one invalid signature was encountered.
  Err:17 http://security.debian.org wheezy/updates InRelease                
    At least one invalid signature was encountered.
  Hit:37 http://archive.canonical.com/ubuntu zesty InRelease                
  Err:18 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease        
    At least one invalid signature was encountered.
  Ign:38 http://ftp.debian.org/debian wheezy InRelease                     
  Err:19 http://mirrors.kernel.org/ubuntu zesty InRelease                  
    At least one invalid signature was encountered.
  Err:20 http://mirrors.kernel.org/ubuntu zesty-updates InRelease           
    At least one invalid signature was encountered.
  Hit:39 http://archive.canonical.com/ubuntu precise Release                
  Err:21 http://mirrors.kernel.org/ubuntu zesty-security InRelease          
    At least one invalid signature was encountered.
  Hit:40 http://ftp.debian.org/debian wheezy-updates InRelease              
  Err:22 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease          
    At least one invalid signature was encountered.
  Err:41 http://mirrors.kernel.org/ubuntu precise Release.gpg               
    At least one invalid signature was encountered.
  Hit:42 http://archive.canonical.com/ubuntu trusty Release                
  Err:43 http://mirrors.kernel.org/ubuntu trusty Release.gpg               
    At least one invalid signature was encountered.
  Hit:44 http://ftp.debian.org/debian jessie Release  
  Err:26 http://security.ubuntu.com/ubuntu xenial-security InRelease
    At least one invalid signature was encountered.
  Err:27 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease
    At least one invalid signature was encountered.
  Err:28 http://ftp.debian.org/debian unstable InRelease
    At least one invalid signature was encountered.
  Hit:45 http://ftp.debian.org/debian wheezy Release  
  Err:30 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease
    At least one invalid signature was encountered.
  Err:31 http://ftp.debian.org/debian testing InRelease
    At least one invalid signature was encountered.
  Err:32 http://archive.canonical.com/ubuntu xenial InRelease
    At least one invalid signature was encountered.
  Err:33 http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease
    At least one invalid signature was encountered.
  Err:35 http://archive.canonical.com/ubuntu yakkety InRelease
    At least one invalid signature was encountered.
  Err:36 http://ftp.debian.org/debian jessie-updates InRelease
    At least one invalid signature was encountered.
  Err:37 http://archive.canonical.com/ubuntu zesty InRelease
    At least one invalid signature was encountered.
  Err:46 http://archive.canonical.com/ubuntu precise Release.gpg
    At least one invalid signature was encountered.
  Err:40 http://ftp.debian.org/debian wheezy-updates InRelease
    At least one invalid signature was encountered.
  Err:47 http://archive.canonical.com/ubuntu trusty Release.gpg
    At least one invalid signature was encountered.
  Err:48 http://ftp.debian.org/debian jessie Release.gpg
    At least one invalid signature was encountered.
  Err:49 http://ftp.debian.org/debian wheezy Release.gpg
    At least one invalid signature was encountered.
  Fetched 981 kB in 1s (496 kB/s)
  Reading package lists... Done
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu xenial InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu xenial-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu xenial-security InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu precise-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu precise-security InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu precise-proposed InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu trusty-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu trusty-security InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu trusty-proposed InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.debian.org jessie/updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu xenial-proposed InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu yakkety InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu yakkety-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu yakkety-security InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.debian.org wheezy/updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu zesty InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu zesty-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu zesty-security InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu zesty-proposed InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu precise Release: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.kernel.org/ubuntu trusty Release: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.debian.org/debian unstable InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.debian.org/debian testing InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu xenial InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu xenial InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu yakkety InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.debian.org/debian jessie-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu zesty InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu precise Release: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.debian.org/debian wheezy-updates InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu trusty Release: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.debian.org/debian jessie Release: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.debian.org/debian wheezy Release: At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/xenial/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/xenial-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/xenial-security/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu/dists/vivid/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ppa.launchpad.net/snappy-dev/image/ubuntu/dists/vivid/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu/dists/xenial/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/precise-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/precise-security/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/precise-proposed/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/trusty-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/trusty-security/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/trusty-proposed/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/xenial-proposed/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/xenial/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/yakkety/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/yakkety-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/yakkety-security/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/yakkety-proposed/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/yakkety/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/zesty/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/zesty-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/zesty-security/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/zesty-proposed/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/zesty/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/unstable/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/testing/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/wheezy-updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://security.debian.org/dists/wheezy/updates/InRelease  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/precise/Release.gpg  At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/trusty/Release.gpg  At least one invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/Release.gpg  At least one invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/trusty/Release.gpg  At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/jessie/Release.gpg  At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/wheezy/Release.gpg  At least one invalid signature was encountered.
  W: Some index files failed to download. They have been ignored, or old ones used instead.
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  The following packages were automatically installed and are no longer required:
    linux-headers-4.4.0-21 linux-headers-4.4.0-21-generic linux-headers-4.4.0-22 linux-headers-4.4.0-22-generic
    linux-headers-4.4.0-24 linux-headers-4.4.0-24-generic linux-headers-4.4.0-28 linux-headers-4.4.0-28-generic
    linux-headers-4.4.0-31 linux-headers-4.4.0-31-generic linux-headers-4.4.0-34 linux-headers-4.4.0-34-generic
    linux-headers-4.4.0-36 linux-headers-4.4.0-36-generic linux-headers-4.4.0-38 linux-headers-4.4.0-38-generic
    linux-image-4.4.0-21-generic linux-image-4.4.0-22-generic linux-image-4.4.0-24-generic
    linux-image-4.4.0-28-generic linux-image-4.4.0-31-generic linux-image-4.4.0-34-generic
    linux-image-4.4.0-36-generic linux-image-4.4.0-38-generic
  Use 'sudo apt autoremove' to remove them.
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


  I'll attach the full terminal log soon.

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: apt 1.2.15
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Nov 16 12:29:54 2016
  InstallationDate: Installed on 2012-10-18 (1490 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  SourcePackage: apt
  UpgradeStatus: Upgraded to xenial on 2016-04-30 (200 days ago)

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