Upgrade to 23.10 fails with error 'unresolvable problem...'

[Walders]

Upgrade to 23.10 fails with an error:

"
Calculating the changes

Could not calculate 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'. "

I have been unable to identify the broken packages, and unable to fix from solutions offered in other message boards.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: ubuntu-release-upgrader-core 1:23.04.7
ProcVersionSignature: Ubuntu 6.2.0-39.40-generic 6.2.16
Uname: Linux 6.2.0-39-generic x86_64
ApportVersion: 2.26.1-0ubuntu2.1
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CrashReports:
 644:1000:124:0:2023-12-17 18:00:37.697791754 +0000:2023-12-17 18:00:37.697791754 +0000:/var/crash/_usr_libexec_tracker-extract-3.1000.upload
 640:1000:124:1625894:2023-12-17 18:00:37.697791754 +0000:2023-12-17 18:00:37.745790631 +0000:/var/crash/_usr_libexec_tracker-extract-3.1000.crash
 600:117:124:37:2023-12-17 18:00:40.657719320 +0000:2023-12-17 18:00:40.657719320 +0000:/var/crash/_usr_libexec_tracker-extract-3.1000.uploaded
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 17 20:15:34 2023
InstallationDate: Installed on 2023-12-16 (1 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to lunar on 2023-12-17 (0 days ago)
VarLogDistupgradeTermlog: