Error when trying to upgrade kubuntu 23.04 to 23.10

[Lin Stein]

I have been trying to upgrade kubuntu 23.04 to 23.10 via konsole. Messages are:

$ pkexec do-release-upgrade -m desktop -f DistUpgradeViewKDE
Checking for a new Ubuntu release
kde
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
authenticate 'mantic.tar.gz' against 'mantic.tar.gz.gpg'
extracting 'mantic.tar.gz'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
exitMainLoopMidFlight

I then get an error in a window:

Cant install 'kubuntu desktop'
It was impossible to install a required package. Please report this as a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

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
CurrentDesktop: KDE
Date: Wed Dec 27 15:56:03 2023
InstallationDate: Installed on 2023-09-15 (102 days ago)
InstallationMedia: Kubuntu 23.04 "Lunar Lobster" - Release amd64 (20230414.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to lunar on 2023-12-27 (0 days ago)
VarLogDistupgradeTermlog: