Upgrading to LTS 24

[Surerdre]

When doing do-release-upgrade, it fails alwyas with same problem:
An unresolvable problem occurred while calculating the upgrade.
And no helpful mesage to know how to resolve.
I'm not software expert, so very lost. Tried many approaches from searching online related to problem, but it remains. Example checking apt.log and removing 'Broken' - but not sure if by removing blind-ly will crash system, so very afraid.
Please help - Thanks a lot

1) Current system: 22.04.5

2) apt-cache policy pkgname: Unable to locate package pkgname

3) To upgrade to newest LTS version

4) An unresolvable problem occurred while calculating the upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubuntu-release-upgrader-core 1:22.04.20
ProcVersionSignature: Ubuntu 6.2.0-1009.9~22.04.1-lowlatency 6.2.13
Uname: Linux 6.2.0-1009-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu82.6
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 19 20:30:31 2024
InstallationDate: Installed on 2018-06-02 (2331 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to jammy on 2024-10-19 (0 days ago)
VarLogDistupgradeAptHistorylog:
 Start-Date: 2024-10-19 20:21:54
 Requested-By: white (1000)
 End-Date: 2024-10-19 20:21:54
VarLogDistupgradeApttermlog:
 Log started: 2024-10-19 20:21:54
 Log ended: 2024-10-19 20:21:54
mtime.conffile..etc.update-manager.release-upgrades: 2024-09-14T22:42:04.203111