Trying to upgrade from 20.04 to 22.04.

[Kevin Carson]

Upgrade can't be calculated but not clear what the problem is. I did remove 3rd party applications and repositories beforehand.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.40
ProcVersionSignature: Ubuntu 5.15.0-67.74~20.04.1-generic 5.15.85
Uname: Linux 5.15.0-67-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 10 07:39:40 2023
InstallationDate: Installed on 2021-01-09 (790 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2023-03-10 (0 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Giuseppe D'Angelo (dangelo)]

I've got an identical problem.

* Removed all 3rd party packages; and removed the corresponding sources.list entries
* apt list '?obsolete' => returns nothing
* No package is manually hold (apt-mark showhold is empty)

Still the upgrade fails with the same error message:

2023-03-10 16:41:43,623 DEBUG Marking 'ubuntu-desktop' for upgrade
2023-03-10 16:41:43,744 WARNING Can't mark 'ubuntu-desktop' for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
2023-03-10 16:41:44,001 ERROR Dist-upgrade failed: 'Broken packages after upgrade: evolution-data-server, gnome-control-center, libgirepository-1.0-1, ubuntu-desktop'

Just to exclude the possibility that there is some broken package installed, is there a way to check that all the packages on my system are *official* packages? (Basically, coming from Ubuntu, and each one at the "expected version" and not some broken version somehow, that would impede the upgrade).

[Giuseppe D'Angelo (dangelo)]

As a further experiment, I've raised in /etc/apt/preferences the priority of focal's repositories to 1100, in order to check if I've currently got packages that have been bumped above the official version (say, by a broken PPA) -- nothing.

(1100 should allow for downgrades.)

[Kevin Carson (kevincarson)]

Inspired by Giuseppe's comments, I tracked down some obsolete packages using "apt list '?obsolete'" and removed those as well as their lingering dependencies. I also checked if there were any held packages using "apt-mark showhold" and there were none.

Unfortunately, after another try of doing the update-manager, it crashed complaining about an I/O error with X11. Another run complained about running a window as root within another user's session being not allowed and I am now faced with a partial upgrade situation as the apt sources were left steered to 22.04 :(

[Nick Rosbrook (enr0n)]

This is a duplicate of bug 2009895, and should be resolved now.