Upgrade from Lubuntu kinetic to Lubuntu Lunar beta fails

[Leó Kolbeinsson]

Attempting to upgrade from Kinetic Lubuntu to Lunar Lubuntu fails with following error:

 Could not determine the upgrade

An unresolvable problem occurred while calculating the upgrade.

This was caused by:
* Upgrading to a pre-release version of Ubuntu
This is most likely a transient problem,
please try again later.
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'.

Restoring original system state

Aborting

----------------------------

This has been attempted several times in the past 24 hours on different machines with same result.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: ubuntu-release-upgrader-core 1:22.10.8
ProcVersionSignature: Ubuntu 5.19.0-40.41-generic 5.19.17
Uname: Linux 5.19.0-40-generic x86_64
ApportVersion: 2.23.1-0ubuntu3.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: LXQt
Date: Fri Mar 31 09:26:32 2023
InstallationDate: Installed on 2023-03-31 (0 days ago)
InstallationMedia: Lubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221017.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to kinetic on 2023-03-31 (0 days ago)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/2013475

[Paride Legovini (paride)]

I can reproduce this by:

1. Starting a Kinetic LXD container
2. apt update && apt full-upgrade
3. apt install lubuntu-desktop
4. do-release-upgrade -d

Note that I'm explicitly asking for the devel release (-d).

If I do not install lubuntu-desktop (step 3) then the upgrade works, so this looks like somehow specific to lubuntu. This is confirmed by the fact that in automation upgrades done by auto-upgrade-testing work fine.

[Paride Legovini (paride)]

I tried manually replacing kinetic with lunar in sources.list and then doing the upgrade manually, hoping to see a trivial dependency issue:

1. sed -i 's/kinetic/lunar/' sources.list
2. sudo apt update
3. sudo apt full-upgrade

but this appears to be working (dependencies are resolved and the upgrade starts).

[Leó Kolbeinsson (leok)]

Just completed upgrade from Kinetic to Lunar Lubuntu -

ASUS Pro H610M-C i7-12700 Motherboard,32GB,Intel UHDGraphics 770,Intel 219-V GB Ethernet,1TB Intel SSD
Upgrade Lubuntu Kinetic to Lubuntu Lunar using TUI
lsb_release - r shows 23.04 Prompt = normal - all good