Upgrade from Ubuntu 22.04 to 23.04 failed

[Guillaume M]

Message was:

Could not determine the upgrade

An unresolvable problem occurred while calculating the upgrade.

If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubuntu-release-upgrader-core 1:22.04.17
ProcVersionSignature: Ubuntu 6.2.0-35.35~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-35-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia wl
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 19 18:06:42 2023
InstallationDate: Installed on 2020-10-31 (1082 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to jammy on 2023-10-19 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2023-10-19T17:40:17.242130

[tomtomtom (tomtomtom)]

Upgrades are only supported to the next Version or from LTS to LTS.

From 22.04 the only supported upgrade is 22.10.

The archives for 22.10 are offline because it has reached EoS, archives are only available in oldreleases repository.