Public bug reported:

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:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade

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

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

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