[Bug 1947977] Re: 'ubuntu-minimal' could not be located during release upgrade

[Brian Murray]

It looks like there was a transitory issue connecting to the mirror of
the Ubuntu archive you use.

2021-10-21 11:42:01,876 DEBUG examining: 'deb http://ke.archive.ubuntu.com/ubuntu/ focal main restricted'
2021-10-21 11:42:01,876 DEBUG verifySourcesListEntry: deb http://ke.archive.ubuntu.com/ubuntu/ hirsute main restricted
2021-10-21 11:42:01,876 DEBUG url_downloadable: http://ke.archive.ubuntu.com/ubuntu//dists/hirsute/Release
2021-10-21 11:42:01,876 DEBUG s='http' n='ke.archive.ubuntu.com' p='/ubuntu//dists/hirsute/Release' q='' f=''
2021-10-21 11:42:02,040 DEBUG error from httplib: 'HTTP Error 500: Internal Server Error'

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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

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

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

Bug description:
  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

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