[Bug 1916959] Re: Start of LTS upgrade 18.04 to 20.04 failed/aborted

[Brian Murray]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains package version numbers greater than the release to which
you are upgrading. You can revert the PPA by installing the ppa-purge
package from the official Ubuntu archive and then running 'sudo ppa-
purge ppa:oibaf/graphics-drivers'.  After that you can try upgrading
again and if it still fails open a new bug report.  Thanks and good
luck!

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

** Tags added: ppa xorg-oibaf-ppa

** This bug has been marked a duplicate of bug 1069133
   Get upgrade error 12.04 - 12.10 "Could not determine upgrade" - xorg from ppa

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https://bugs.launchpad.net/bugs/1916959

Title:
  Start of LTS upgrade 18.04 to 20.04 failed/aborted

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

Bug description:
  do-release-upgrade aborted with error:

  "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. "

  
  Before that it aborted and told to use ppa-purge, but not which package to purge, so I removed all launchpad/ppa sources from the source list.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-136.140-generic 4.15.18
  Uname: Linux 4.15.0-136-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Feb 25 22:57:24 2021
  InstallationDate: Installed on 2016-04-28 (1764 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-25 (0 days ago)
  VarLogDistupgradeTermlog:

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