[Bug 1986628] Re: can not upgrade to the next ubuntu after disabling all ppas

[Nick Rosbrook]

** This bug is no longer a duplicate of bug 702762
   wine installs unneeded japanese font ttf-umefont

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https://bugs.launchpad.net/bugs/1986628

Title:
  can not upgrade to the next ubuntu after disabling all ppas

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

Bug description:
  During upgrade:

  ```
  An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:
   * Unofficial software packages not provided by Ubuntu
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'.
  ```

  I disabled all "Other Software" sources.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.38
  ProcVersionSignature: Ubuntu 5.15.0-46.49~20.04.1-generic 5.15.39
  Uname: Linux 5.15.0-46-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Aug 16 14:24:26 2022
  InstallationDate: Installed on 2022-04-12 (125 days ago)
  InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2022-08-16 (0 days ago)
  VarLogDistupgradeTermlog:

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