[Bug 1876298] Re: Upgrade from Ubuntu Mate 18.04 to 20.04 fails

[Ingo Wilhelm]

I found the problem.

/var/log/dist-upgrade/apt.log
contained the lines

Broken libk3b7-extracodecs:amd64 Depends on libavcodec58:amd64 < none | 7:4.2.2-1ubuntu1 @un uH > (>= 7:4.0)
  Considering libavcodec58:amd64 70 as a solution to libk3b7-extracodecs:amd64 1
  MarkKeep libk3b7-extracodecs:amd64 < 17.12.3-0ubuntu3 -> 19.12.3-0ubuntu1 @ii umU Ib > FU=0
  Holding Back libk3b7-extracodecs:amd64 rather than change libavcodec58:amd64

I eventually found out that libk3b7-extracodecs belongs to the DVD
burning application K3B.

After deinstalling K3B with

apt remove k3b
apt autoremove

the upgrade to Ubuntu Mate 20.04 was successful.

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https://bugs.launchpad.net/bugs/1876298

Title:
  Upgrade from Ubuntu Mate 18.04 to 20.04 fails

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

Bug description:
  An upgrade from Ubuntu Mate 18.04 to 20.04 fails.

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

  2020-05-01 14:53:13,658 DEBUG need_server_mode(): run in 'desktop' mode, (because of key deps for 'ubuntu-desktop')
  2020-05-01 14:58:12,251 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  Running
  apt remove ubuntu-desktop
  results in 
  Package 'ubuntu-desktop' is not installed, so not removed

  So ubuntu-desktop is not installed ...

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
  Uname: Linux 4.15.0-99-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri May  1 15:02:56 2020
  InstallationDate: Installed on 2015-06-14 (1782 days ago)
  InstallationMedia: Ubuntu MATE 14.04.1 "Trusty Tahr" - final amd64 (20141111)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-05-01 (0 days ago)
  VarLogDistupgradeTermlog:

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