[Bug 1898815] Re: Focal upgrade fails, can't mark packages for upgrade

[bgarnham]

This was resolved by removing xubuntu-desktop and xubuntu-core, while
using Mate, then running the upgrade again. xubuntu-desktop was then
reinstalled, following the upgrade, and works normally.

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https://bugs.launchpad.net/bugs/1898815

Title:
  Focal upgrade fails, can't mark packages for upgrade

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

Bug description:
  Upgrade from 18.04.5 to 20.04.1 fails.

  /var/log/dist-upgrade/main.log shows:

  2020-10-06 20:35:21,194 DEBUG Marking 'xubuntu-core' for upgrade
  2020-10-06 20:35:21,349 WARNING Can't mark 'xubuntu-core' for upgrade (E:Unable to correct problems, you have held broken packages.)
  2020-10-06 20:35:21,349 DEBUG Marking 'xubuntu-desktop' for upgrade
  2020-10-06 20:35:21,525 WARNING Can't mark 'xubuntu-desktop' for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
  2020-10-06 20:35:21,526 DEBUG Marking 'ubuntu-mate-core' for upgrade
  2020-10-06 20:35:21,666 WARNING Can't mark 'ubuntu-mate-core' for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
  2020-10-06 20:35:21,667 DEBUG Marking 'ubuntu-mate-desktop' for upgrade
  2020-10-06 20:35:21,809 WARNING Can't mark 'ubuntu-mate-desktop' for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
  2020-10-06 20:35:51,326 ERROR Dist-upgrade failed: 'Broken packages after upgrade: xubuntu-core, xubuntu-desktop'

  Synaptic shows no broken packages.

  $ sudo apt update --fix-missing
  ...All packages are up to date.

  $ sudo apt install -f
  ...0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

  $ dpkg --get-selections | grep hold
  (returns nothing.)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Tue Oct  6 20:42:00 2020
  InstallationDate: Installed on 2018-03-23 (928 days ago)
  InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-07 (0 days ago)
  VarLogDistupgradeTermlog:

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