[Bug 1775883] Re: Failed to upgrade 16.04.4 to 18.04. Process aborted

[Brian Murray]

You have installed packages from the ubuntu-toolchain test PPA and that
is preventing the upgrader from calculating the upgrade as there are
packages installed greater than the version in 18.04. Please use ppa-
purge to remove that PPA and then try the upgrade again.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1775883

Title:
  Failed to upgrade 16.04.4 to 18.04. Process aborted

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

Bug description:
  Tried doing an upgrade from 16.04.4 to 18.04 by using the command

  "sudo do-release-upgrade -d -m -desktop"

  It failed giving the following errors:

  (appstreamcli:16680): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:16680): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:16680): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:16680): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
  AppStream cache update completed, but some metadata was ignored due to errors.

  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.

  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

  ========================================
  $ lsb_release -rd
  Description:	Ubuntu 16.04.4 LTS
  Release:	16.04

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-45-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Jun  9 02:19:03 2018
  InstallationDate: Installed on 2016-05-01 (768 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-06-08 (0 days ago)

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