[Bug 1970018] Re: Cannot upgrade to ubuntu 21.10 from ubuntu 20.04.

[Brian Murray]

It is not sufficient to just disable the "Other software" as you will
still have package version from other repositories, like the deadsnakes
PPA, which may provide package versions greater than the release to
which you are upgrading. Subsequently, you'll need to reenable the other
software sources and then use the tool ppa-purge to remove packages from
PPAs.

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

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https://bugs.launchpad.net/bugs/1970018

Title:
  Cannot upgrade to ubuntu 21.10 from ubuntu 20.04.

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

Bug description:
  Tried disabling all "Other software" in Software & Updates, but that
  didn't work either.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.38
  ProcVersionSignature: Ubuntu 5.13.0-40.45~20.04.1-generic 5.13.19
  Uname: Linux 5.13.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.23
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 23 09:41:55 2022
  InstallationDate: Installed on 2020-08-06 (624 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2022-04-23 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2022-04-23T09:32:17.795290

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