[Bug 1932151] Re: Not upgraded from Ubuntu 16.04 to Ubuntu 18.04

[Chris Guiver]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1932151

Title:
  Not upgraded from Ubuntu 16.04 to Ubuntu 18.04

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

Bug description:
  (base) ambikeya at ambikeya-HP-ProBook-440-G2:~$ sudo do-release-upgrade 
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [819 B]                                                                                                                          
  Get:2 Upgrade tool [1,247 kB]                                                                                                                                 
  Fetched 1,247 kB in 0s (0 B/s)                                                                                                                                
  authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
  extracting 'bionic.tar.gz'

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree        
  Reading state information... Done
  Hit http://archive.ubuntu.com/ubuntu xenial InRelease                                                                                                         
  Get:1 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]                                                                                      
  Get:2 http://archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]                                                                                    
  Get:3 http://archive.ubuntu.com/ubuntu xenial-security InRelease [109 kB]                                                                                     
  Fetched 325 kB in 0s (0 B/s)                                                                                                                                  
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  The Robot Operating System (ROS) is installed

  It appears that ROS is currently installed. Each ROS release is very 
  strict about the versions of Ubuntu it supports, and Ubuntu upgrades 
  can fail if that guidance isn't followed. Before continuing, please 
  either uninstall ROS, or ensure the ROS release you have installed 
  supports the version of Ubuntu to which you're upgrading. 

  For ROS 1 releases, refer to REP 3: 
  https://www.ros.org/reps/rep-0003.html 

  For ROS 2 releases, refer to REP 2000: 
  https://www.ros.org/reps/rep-2000.html 

  Are you sure you want to continue?

  Continue [yN] y
  No snaps are installed yet. Try 'snap install hello-world'.

  Checking for installed snaps

  Calculating snap size requirements

  Updating repository information
  Hit http://archive.ubuntu.com/ubuntu bionic InRelease                                                                                                         
  Hit http://archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                                                 
  Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                                               
  Hit http://archive.ubuntu.com/ubuntu bionic-security InRelease                                                                                                
  Fetched 0 B in 0s (0 B/s)                                                                                                                                     

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.15.0-142.146~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-142-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Jun 16 14:46:52 2021
  InstallationDate: Installed on 2019-01-12 (886 days ago)
  InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2021-06-16 (0 days ago)

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