Public bug reported:

The release upgrade from 20.04 to 21.04 kept failing because some
foreign packages were installed. After I attempted removing the said
packages - using the "Software & Updates" GUI tool, the upgrade failed
because "the essential package 'ubuntu-minimal' could not be located on
the system".

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.36
ProcVersionSignature: Ubuntu 5.11.0-38.42~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-38-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Thu Oct 21 11:42:14 2021
InstallationDate: Installed on 2020-06-23 (484 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2021-10-21 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2021-10-21 11:41:48.737310
 Log time: 2021-10-21 11:41:53.536546
 Log time: 2021-10-21 11:42:14.033802
 Log time: 2021-10-21 11:42:15.661275
mtime.conffile..etc.update-manager.release-upgrades: 2021-10-21T10:31:39.609905

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


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

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https://bugs.launchpad.net/bugs/1947977

Title:
  'ubuntu-minimal' could not be located during release upgrade

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