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

[Ingo Wilhelm]

Public bug reported:

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:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade

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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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