Public bug reported:
When executing:
sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [833 B]
Get:2 Upgrade tool [1,267 kB]
Fetched 1,268 kB in 0s (0 B/s)
authenticate 'jammy.tar.gz' against 'jammy.tar.gz.gpg'
extracting 'jammy.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://archive.canonical.com/ubuntu focal InRelease
Hit http://security.ubuntu.com/ubuntu focal-security InRelease
Hit http://archive.ubuntu.com/ubuntu focal InRelease
Hit http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit http://archive.ubuntu.com/ubuntu focal-backports InRelease
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
None
Checking for installed snaps
Calculating snap size requirements
Updating repository information
[...]
Fetched 73.7 MB in 6s (11.5 MB/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 1:20.04.41
ProcVersionSignature: Ubuntu 5.15.0-139.149~20.04.1-generic 5.15.178
Uname: Linux 5.15.0-139-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.31
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 12 17:16:23 2025
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-focal-amd64-20200502-85
InstallationDate: Installed on 2022-08-20 (1180 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2025-11-12 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade focal
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https://bugs.launchpad.net/bugs/2131162
Title:
Upgrade to Ubuntu 20.04 to 22.04 failed for An unresolvable problem
occurred while calculating the upgrade
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