sudo do-release-upgrade -d -f DistUpgradeViewGtk3 failed early

[Michael Arlt]

There are no ppa's installed.
It was a new 20.10 installation a few days ago.

In an early phase I get this message (translated from German):

Could not determine which system updates are available

An unsolvable problem occurred during the system update calculation.

 It was probably caused by:
 * Unofficial software packages that are not provided by Ubuntu.
Please use the tool "ppa-purge" from the ppa-purge-
package to remove software from a Launchpad PPA and try to
try the system update again.

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 at "/var/log/dist-upgrade" for system upgrade details. In particular, look at "main.log" and "apt.log".

Translated with www.DeepL.com/Translator (free version)

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubuntu-release-upgrader-core 1:20.10.14
ProcVersionSignature: Ubuntu 5.8.0-50.56-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Thu Apr 22 16:28:34 2021
InstallationDate: Installed on 2021-04-12 (10 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to groovy on 2021-04-22 (0 days ago)
VarLogDistupgradeTermlog:

[Michael Arlt (qwertologe)]

dmesg without personal data