Public bug reported:
Similar to #1069160, but different cause (error message wording). Exact
error msg test:
Could not calculate the upgrade
An unresolved problem occurred while calculating the upgrade. If none of this
applies, then please report this bug using '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'.
Received error message running upgrade going from 24.04.5 LTS to 26.04.1
LTS.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.29
ProcVersionSignature: Ubuntu 6.11.0-1016.17~24.04.1-lowlatency 6.11.11
Uname: Linux 6.11.0-1016-lowlatency x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Thu Oct 1 09:43:57 2026
InstallationDate: Installed on 2025-04-13 (536 days ago)
InstallationMedia: Ubuntu-Studio 24.04.2 LTS "Noble Numbat" - Release amd64
(20250215)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to noble on 2026-10-01 (0 days ago)
VarLogDistupgradeAptHistorylog:
Start-Date: 2026-10-01 09:31:45
Requested-By: dan (1000)
End-Date: 2026-10-01 09:31:45
VarLogDistupgradeApttermlog:
Log started: 2026-10-01 09:31:45
Log ended: 2026-10-01 09:31:45
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade noble
** Attachment added: "copy of /var/log/dist-upgrade/main.log"
https://bugs.launchpad.net/bugs/2169187/+attachment/6004473/+files/main.log
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https://bugs.launchpad.net/bugs/2169187
Title:
unresolvable problem occurred while calculating upgrade to 26.04 LTS
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