Using software updater from 23.04 to 23.10 fails with "An unresolvable problem". It says that I should remove launchpad PPA packages but I don't see that I would have any in sources.list or by applying apt-cache policy

[Sami Rintamäki]

Using software updater from 23.04 to 23.10 fails with "An unresolvable problem".

It says that I should remove launchpad PPA packages but I don't see that I would have any in sources.list or by aplying apt-cache policy.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: ubuntu-release-upgrader-core 1:23.04.7
ProcVersionSignature: Ubuntu 6.2.0-37.38-generic 6.2.16
Uname: Linux 6.2.0-37-generic x86_64
ApportVersion: 2.26.1-0ubuntu2.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CrashReports:
 640:1001:116:392218:2023-11-30 09:21:50.872889041 +0200:2023-11-30 09:21:51.872889041 +0200:/var/crash/_usr_bin_dunst.1001.crash
 640:124:116:397485:2023-11-30 08:39:15.549159841 +0200:2023-11-30 08:39:10.769191379 +0200:/var/crash/_usr_bin_dunst.124.crash
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 30 09:58:37 2023
InstallationDate: Installed on 2016-07-09 (2699 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to lunar on 2023-11-30 (0 days ago)
VarLogDistupgradeTermlog: