[Bug 1793079] Re: Unable to upgrade from Ubuntu 16 to 18.

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

** Tags added: third-party-packages

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https://bugs.launchpad.net/bugs/1793079

Title:
  Unable to upgrade from Ubuntu 16 to 18.

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

Bug description:
  I have 16.04.5 LTS. I have run sudo apt-get update, upgrade and autoremove (to remove broken packages).
  When I run sudo do-release-upgrade, it starts off fine but then it aborts the upgrade. Here is the end of the output:

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

  Calculating the changes

  Calculating the changes

  Could not determine the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 

  
  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 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
  Uname: Linux 4.4.0-135-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Sep 18 08:36:02 2018
  InstallationDate: Installed on 2014-11-06 (1411 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-09-18 (0 days ago)

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