[Bug 1900148] Re: Bugreport on Update 20.04, not possible to update

[Jakob Hagedorn]

Many thanks Brian!
I tried to use ppa-purge. Unfortunately, I have forgotten what exactly was installed from a ppa and cannot find the correct -o or -p name to add.
I  tried a dpkg --list to search whether any packages indicate they are from a ppa (probably a stupid idea to you, but this is my level of knowledge)
Which command would help me to learn what the correct ppa-purge would have to be?

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https://bugs.launchpad.net/bugs/1900148

Title:
  Bugreport on Update 20.04, not possible to update

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

Bug description:
  I got this alert when I tried to update my system:
  "Es konnte nicht ermittelt werden, welche Systemaktualisierungen verfügbar sind

  Ein unlösbares Problem trat während der Berechnung der
  Systemaktualisierung auf.

   Wenn keine dieser zutrifft, melden Sie bitte den Fehler mithilfe des
  Befehls 'ubuntu-bug ubuntu-release-upgrader-core' in einem Terminal.
  Wenn Sie dies selbst untersuchen möchten, finden Sie in den
  Protokolldateien unter »/var/log/dist-upgrade« Details zur
  Systemaktualisierung. Schauen Sie sich insbesondere »main.log« und
  »apt.log« an."

  Sry that it is in german. The Google translator says this:

  "It could not be determined which system updates are available

  An unsolvable problem occurred while calculating the system update.

   If none of these apply, please report the bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want
  to investigate this yourself, see the log files under / var / log /
  dist-upgrade for details about the system upgrade. In particular, look
  at "main.log" and "apt.log"."

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-51.56~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Oct 16 16:04:50 2020
  InstallationDate: Installed on 2019-06-26 (477 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-16 (0 days ago)
  VarLogDistupgradeTermlog:

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