[Bug 2116208] Re: update ubuntu 20.04 to 22.04 fail:"ERROR Dist-upgrade failed: 'The package 'update-manager' is marked for removal but it is in the removal deny list.'"

[Enock Kasaadha]

*** This bug is a duplicate of bug 2084610 ***
    https://bugs.launchpad.net/bugs/2084610

Marking as a duplicate of bug #2084610. Same upgrader failure ("update-
manager marked for removal but in the removal deny list"), different
upgrade path (20.04 to 22.04 here, vs 23.04 to 24.04 in bug #2084610 ).
The underlying upgrader code path that hard-fails on the denylist
conflict is the same.

** This bug has been marked a duplicate of bug 2084610
   Update marks update-manager for removal causing to abort

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https://bugs.launchpad.net/bugs/2116208

Title:
  update ubuntu 20.04 to 22.04 fail:"ERROR Dist-upgrade failed: 'The
  package 'update-manager' is marked for removal but it is in the
  removal deny list.'"

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

Bug description:
  have not any idea to fix error when upgrade system from 20.04 to
  22.04,get this error at /var/log/dist-upgrade/main.log: ERROR Dist-
  upgrade failed: 'The package 'update-manager' is marked for removal
  but it is in the removal deny list.'

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.41
  ProcVersionSignature: Ubuntu 5.4.0-216.236-generic 5.4.291
  Uname: Linux 5.4.0-216-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.29
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Wed Jul  9 01:57:17 2025
  InstallationDate: Installed on 2021-05-04 (1526 days ago)
  InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2025-07-08 (0 days ago)

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