[Bug 1914846] Re: cannot upgrade from 16.04 to 18.04

[Humphrey van Polanen Petel]

trying to upgrade from command line gives this:

~$ sudo apt update && sudo apt dist-upgrade
[sudo] password for humphrey: 
Ign:1 http://au.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://au.archive.ubuntu.com/ubuntu xenial-updates InRelease             
Ign:3 http://au.archive.ubuntu.com/ubuntu xenial-backports InRelease           
Err:4 http://au.archive.ubuntu.com/ubuntu xenial Release                       
  403  Forbidden [IP: 202.158.214.106 80]
Hit:5 http://au.archive.ubuntu.com/ubuntu xenial-backports Release             
Hit:7 http://apt.insynchq.com/ubuntu xenial InRelease                          
Err:7 http://apt.insynchq.com/ubuntu xenial InRelease                          
  The following signatures were invalid: KEYEXPIRED 1599756787  KEYEXPIRED 1599757948  KEYEXPIRED 1599756787  KEYEXPIRED 1599756787  KEYEXPIRED 1599757948
Hit:9 http://ppa.launchpad.net/fingerprint/fingerprint-gui/ubuntu xenial InRelease
Get:8 http://apt.insync.io/ubuntu xenial InRelease [5,539 B]                   
Get:10 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]    
Err:8 http://apt.insync.io/ubuntu xenial InRelease                             
  The following signatures were invalid: KEYEXPIRED 1599756787  KEYEXPIRED 1599757948  KEYEXPIRED 1599756787  KEYEXPIRED 1599756787  KEYEXPIRED 1599757948
Hit:11 http://archive.canonical.com/ubuntu xenial InRelease                    
Reading package lists... Done                                   
E: The repository 'http://au.archive.ubuntu.com/ubuntu xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://apt.insynchq.com/ubuntu xenial InRelease: The following signatures were invalid: KEYEXPIRED 1599756787  KEYEXPIRED 1599757948  KEYEXPIRED 1599756787  KEYEXPIRED 1599756787  KEYEXPIRED 1599757948
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://apt.insync.io/ubuntu xenial InRelease: The following signatures were invalid: KEYEXPIRED 1599756787  KEYEXPIRED 1599757948  KEYEXPIRED 1599756787  KEYEXPIRED 1599756787  KEYEXPIRED 1599757948
humphrey at Gummitch:~$

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https://bugs.launchpad.net/bugs/1914846

Title:
  cannot upgrade from 16.04 to 18.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Software Updater offered upgrading to 18.04.5 (I have 16.04.7)

  clicking <upgrade> resulted in this warning (all on one line)

  W:The repository 'http://au.archive.ubuntu.com/ubuntu bionic-backports Release' does not have a Release file., 
  W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., 
  W:See apt-secure(8) manpage for repository creation and user configuration details., 
  E:Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/bionic-backports/main/binary-i386/Packages  403  Forbidden [IP: 202.158.214.106 80], 
  E:Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/bionic-updates/main/dep11/icons-64x64.tar  403  Forbidden [IP: 202.158.214.106 80], 
  E:Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/bionic/universe/dep11/icons-64x64.tar  403  Forbidden [IP: 202.158.214.106 80], 
  E:Some index files failed to download. They have been ignored, or old ones used instead.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.15.0-133.137~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-133-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Feb  6 16:52:09 2021
  InstallationDate: Installed on 2018-11-23 (806 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to xenial on 2021-02-06 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2021-02-06 16:38:40.673705
   Log time: 2021-02-06 16:38:47.665694
   Log time: 2021-02-06 16:42:39.710816
  VarLogDistupgradeTermlog:

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