[Bug 1921694] Re: System Upgrade from Bionic to Focal not possible

[Chris Guiver]

Thank you for taking the time to report this bug and helping to make
Ubuntu better.

Bug reporting is mostly about finding & fixing problems thus preventing
future users from hitting the same bug.

I suspect a Support site would be more appropriate, eg.
https://answers.launchpad.net/ubuntu. You can also find help with your
problem in the support forum of your local Ubuntu community
http://loco.ubuntu.com/ or asking at https://askubuntu.com or
https://ubuntuforums.org, or for more support options please look at
https://discourse.ubuntu.com/t/community-support/709

The error message would have suggested using `ppa-purge` to remove all
3rd party packages and not just the PPA sources; I looked and I can see
3rd party packages conflicting with the Ubuntu packages (eg. package(s)
from https://launchpad.net/~oibaf/+ppa-packages but that may not be all)

I've marked this as incomplete; as I found evidence of 3rd party (PPA)
packages. If you believe I'm in error, please leave a comment, and
change the status back to "New"

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

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https://bugs.launchpad.net/bugs/1921694

Title:
  System Upgrade from Bionic to Focal not possible

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

Bug description:
  When trying to upgrade the release from bionic beaver to Focal I
  always get the error message that a critical error has occurred.
  Removing all Launchpad PPAs did not help.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 5.4.0-70.78~18.04.1-generic 5.4.94
  Uname: Linux 5.4.0-70-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Mar 29 10:10:23 2021
  InstallationDate: Installed on 2019-09-22 (553 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-03-29 (0 days ago)
  VarLogDistupgradeTermlog:

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