[Bug 1928555] Re: Upgrade from 18.04 LTS fails

[Brian Murray]

*** This bug is a duplicate of bug 1928397 ***
    https://bugs.launchpad.net/bugs/1928397

** This bug has been marked a duplicate of bug 1928397
   ensure python is marked for removal when upgrading from 18.04 to 20.04

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https://bugs.launchpad.net/bugs/1928555

Title:
  Upgrade from 18.04 LTS fails

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

Bug description:
  do-release-upgrade -m desktop fails with the following message:

  Could not determine 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'.

  main.log shows:

  "ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve
  generated breaks, this may be caused by held packages.'"

  sudo apt-mark showhold doesn't show anything held.

  I have removed all the 3rd party PPAs and applications, muon and
  discover say I have no pending updates, and there are no locked
  packages.

  I have some searching around and it looks spookily similar to bug
  #1875523. Could it be a regression?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
  Uname: Linux 4.15.0-143-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sat May 15 20:22:13 2021
  InstallationDate: Installed on 2019-12-21 (511 days ago)
  InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-15 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2021-05-15T17:34:29.205732

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