unable to upgrade for no specified reason

[robert marshall]

Run in terminal and got
Checking package manager
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done

Calculating the changes

Calculating the changes

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'.

main.log gives
ERROR Dist-upgrade failed: 'Broken packages after upgrade: ubuntu-desktop'
I'd tried it before and was having ppa-purge notifications which I've solved
I see various broken messages in apt.log (not clear which is causing the problem! or whether it's an observation and the upgrade is solving via the update)the last is:

Broken ubuntu-desktop:amd64 Depends on gnome-shell-extension-ubuntu-tiling-assistant:amd64 < none @un mH >
  Considering gnome-shell-extension-ubuntu-tiling-assistant:amd64 1 as a solution to ubuntu-desktop:amd64 10001
 Try to Re-Instate (3) gir1.2-gdm-1.0:amd64
  MarkKeep gir1.2-gdm-1.0:amd64 < 44.0-1ubuntu2 -> 45~beta-1ubuntu1 @ii umU > FU=0
Done

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: unknown
CrashDB: ubuntu
CrashReports:
 600:113:122:37:2023-12-09 07:05:48.461585463 +0000:2023-12-09 07:05:48.461585463 +0000:/var/crash/_usr_bin_kcminit.1000.uploaded
 640:1000:122:146261:2023-12-13 15:57:05.251888990 +0000:2023-12-13 15:57:06.251888990 +0000:/var/crash/_usr_lib_x86_64-linux-gnu_libexec_ksmserver-logout-greeter.1000.crash
 664:1000:1000:0:2023-12-09 07:05:41.549678354 +0000:2023-12-09 07:05:41.549678354 +0000:/var/crash/_usr_bin_kcminit.1000.upload
 640:1000:122:1301590:2023-12-10 14:29:26.705462915 +0000:2023-12-10 14:28:21.690330818 +0000:/var/crash/_usr_bin_convert-im6.q16.1000.crash
CurrentDesktop: KDE
Date: Thu Dec 14 17:50:04 2023
InstallationDate: Installed on 2017-07-22 (2336 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to lunar on 2023-12-14 (0 days ago)
VarLogDistupgradeAptHistorylog:
 Start-Date: 2023-12-14 16:50:03
 Requested-By: robert (1000)
 End-Date: 2023-12-14 16:50:04
VarLogDistupgradeApttermlog:
 Log started: 2023-12-14 16:50:03
 Log ended: 2023-12-14 16:50:04

[robert marshall (robert-capuchin)]

I tried again a few times in one case removing gir1.2-gdm (see above) first which removed quite a few other things. Still got a failure. But today it works and I'm now on 23.10. I guess a fix has also solved this! Many thanks. This can be closed (wasn't certain what final status to give it...)!