Public bug reported:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.4 LTS
Release: 24.04
Codename: noble
$ apt-cache policy ubuntu-release-upgrader
N: Unable to locate package ubuntu-release-upgrader
Attempting to upgrade to 26.04 and failing with "unresolvable problem
occurred while calculating the upgrade" error.
Updated all packages prior to attempting version upgrade.
Got the same error last week and the week prior.
apt.log
Investigating (0) gvfs-backends:amd64 < 1.54.4-0ubuntu1~24.04.2 -> 1.60.0-1 @ii
umU Ib >
Investigating (0) nautilus:amd64 < 1:46.4-0ubuntu0.2 -> 1:50.0-0ubuntu2 @ii umU
Ib >
Investigating (0) gvfs-fuse:amd64 < 1.54.4-0ubuntu1~24.04.2 | 1.60.0-1 @ii umH
Ib >
Investigating (0) libgpod-common:amd64 < 0.8.3-19.1ubuntu4 -> 0.8.3-23 @ii umU
Ib >
Investigating (0) libxs-parse-keyword-perl:amd64 < 0.39-1build3 -> 0.49-1 @ii
umU Ib >
Investigating (0) endeavour:amd64 < 43.0-1build3 -> 43.0-7build1 @ii umU Ib >
Investigating (0) intel-media-va-driver:amd64 < 24.1.0+dfsg1-1ubuntu0.2 ->
26.1.2+dfsg1-1 @ii ugU Ib >
Investigating (0) libyaml-libyaml-perl:amd64 < 0.89+ds-1ubuntu0.24.04.1 ->
0.904.0+ds-1 @ii umU Ib >
Investigating (0) lintian:amd64 < 2.117.0ubuntu1.4 -> 2.129.0ubuntu1 @ii umU Ib
>
Investigating (0) libtepl-6-4:amd64 < 6.8.0-2build4 @ii gK Ib >
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.28
ProcVersionSignature: Ubuntu 6.8.0-107.107-generic 6.8.12
Uname: Linux 6.8.0-107-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 11 12:36:23 2026
InstallationDate: Installed on 2018-02-16 (2977 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180214)
PackageArchitecture: all
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to noble on 2026-04-11 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade noble wayland-session
** Attachment added: "apt.log"
https://bugs.launchpad.net/bugs/2148084/+attachment/5960434/+files/apt.log
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https://bugs.launchpad.net/bugs/2148084
Title:
Upgrade from 24.04.4 LTS to 26.04 Fails with "unresolvable problem
occurred while calculating the upgrade" error
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