Public bug reported:
Trying to upgrade from 25.10 to 26.04
Throws error "COuld not calculate the upgrade"
simply stating an unresolvable error occurred
The Upgrade Failed screen has no following output, then upgrade closes
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: ubuntu-release-upgrader-core 1:25.10.10 [origin: unknown]
ProcVersionSignature: Ubuntu 6.17.0-35.35-generic 6.17.13
Uname: Linux 6.17.0-35-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CrashReports:
640:0:123:1556845:2026-06-05 14:21:58.232820806 -0400:2026-06-05
14:21:57.717420547 -0400:/var/crash/_usr_bin_wireplumber.123.crash
644:0:123:0:2026-06-05 15:33:32.669504262 -0400:2026-06-05 13:08:14.334995172
-0400:/var/crash/kdump_lock
640:1000:123:99050:2026-06-02 07:14:58.159586932 -0400:2026-06-02
07:14:58.158903998 -0400:/var/crash/_usr_bin_blueman-applet.1000.crash
CurrentDesktop: KDE
Date: Fri Jun 5 15:43:47 2026
InstallationDate: Installed on 2024-10-26 (587 days ago)
InstallationMedia: Xubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to questing on 2026-06-05 (0 days ago)
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade questing third-party-packages
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https://bugs.launchpad.net/bugs/2155743
Title:
Uprade to 26.04 fails due to failure to calculate
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