[Bug 1926091] Re: Attempt to upgrade to 20.04 LTS from 18.04 LTS. Fails on suspected PPA anomaly.

[Brian Murray]

Thanks for taking the time to report this upgrade failure. There is
currently a new version of the release upgrader available in -proposed
which may resolve the error you've encountered. Please run the following
command to test the new version of the upgrader:

  do-release-upgrade -p

Please lets us know the results in this bug report. Thanks again and
good luck!

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

** Tags added: lp-1928397

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https://bugs.launchpad.net/bugs/1926091

Title:
  Attempt to upgrade to 20.04 LTS from 18.04 LTS.  Fails on suspected
  PPA anomaly.

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

Bug description:
  Starting with Ubunutu 18.04.5 LTS. While attempting to upgrade to
  Ubuntu 20.04 LTS, installer aborts with

  An unresolvable problem occurred while calculating the upgrade.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  Successful application of ppa-purge was used to downgrade openshot. 
  Other suspected applications: virtualbox and handbrake both removed. 

  Upgrade fails in just the same way.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
  Uname: Linux 4.15.0-142-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Sun Apr 25 17:41:00 2021
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-trusty-amd64-osp1-20150720-0
  InstallationDate: Installed on 2016-09-25 (1672 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20150720-04:06
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-25 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2016-12-12T20:25:16.714340

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