Tried to upgrade to latest LTS on ARM VM.

[Marc A]

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,267 kB]
Fetched 1,267 kB in 0s (0 B/s)
authenticate 'jammy.tar.gz' against 'jammy.tar.gz.gpg'
extracting 'jammy.tar.gz'
[sudo] password for marc:

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://us.ports.ubuntu.com/ubuntu-ports focal InRelease
Hit http://us.ports.ubuntu.com/ubuntu-ports focal-updates InRelease
Hit http://us.ports.ubuntu.com/ubuntu-ports focal-backports InRelease
Hit http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
Hit http://ports.ubuntu.com/ubuntu-ports focal-proposed InRelease
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
none
None

Checking for installed snaps

Calculating snap size requirements

Updating repository information
Hit http://us.ports.ubuntu.com/ubuntu-ports jammy InRelease
Hit http://us.ports.ubuntu.com/ubuntu-ports jammy-updates InRelease
Hit http://us.ports.ubuntu.com/ubuntu-ports jammy-backports InRelease
Hit http://ports.ubuntu.com/ubuntu-ports jammy-security InRelease
Hit http://ports.ubuntu.com/ubuntu-ports jammy-proposed InRelease
Fetched 0 B in 0s (0 B/s)

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Calculating the changes

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'.

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.40
ProcVersionSignature: Ubuntu 5.15.0-60.66~20.04.1-generic 5.15.78
Uname: Linux 5.15.0-60-generic aarch64
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: arm64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 4 17:55:41 2023
InstallationDate: Installed on 2023-02-03 (1 days ago)
InstallationMedia: Ubuntu 20.04.5 LTS "Focal Fossa" - Release arm64 (20230120)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2023-02-04 (0 days ago)
VarLogDistupgradeTermlog: