[Bug 2148084] Re: Upgrade from 24.04.4 LTS to 26.04 Fails with "unresolvable problem occurred while calculating the upgrade" error

[Daniel Tang]

*** This bug is a duplicate of bug 2150319 ***
    https://bugs.launchpad.net/bugs/2150319

** This bug has been marked a duplicate of bug 2150319
   lintian breaks upgrade from 24.04 to 26.04

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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

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  $ 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)

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