[Bug 1998699] [NEW] Ubuntu dist-upgrade 18.04 -> 20.04 fails

[Matthias Schneider]

Public bug reported:

$ grep failed /var/log/dist-upgrade/20221204-1538/main.log 
2022-12-04 15:36:09,282 INFO failed to remove python-minimal
2022-12-04 15:36:09,326 INFO failed to remove libpython-stdlib
2022-12-04 15:36:09,371 INFO failed to remove python-minimal
2022-12-04 15:36:09,371 INFO failed to remove libpython-stdlib
2022-12-04 15:36:11,357 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

I read something about a patched release-upgrader, but it did not work
for me.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 5.4.0-135.152~18.04.2-generic 5.4.212
Uname: Linux 5.4.0-135-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.28
Architecture: amd64
CrashDB: ubuntu
Date: Sun Dec  4 15:52:56 2022
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2022-12-04 (0 days ago)

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


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1998699

Title:
  Ubuntu dist-upgrade 18.04 -> 20.04 fails

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

Bug description:
  $ grep failed /var/log/dist-upgrade/20221204-1538/main.log 
  2022-12-04 15:36:09,282 INFO failed to remove python-minimal
  2022-12-04 15:36:09,326 INFO failed to remove libpython-stdlib
  2022-12-04 15:36:09,371 INFO failed to remove python-minimal
  2022-12-04 15:36:09,371 INFO failed to remove libpython-stdlib
  2022-12-04 15:36:11,357 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

  I read something about a patched release-upgrader, but it did not work
  for me.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.45
  ProcVersionSignature: Ubuntu 5.4.0-135.152~18.04.2-generic 5.4.212
  Uname: Linux 5.4.0-135-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.28
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sun Dec  4 15:52:56 2022
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2022-12-04 (0 days ago)

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