[Bug 2145054] [NEW] Unresolvable problem while calculating the upgrade from Ubuntu 25.04 to 25.10

[Björn]

Public bug reported:

During upgrade, this error message pops up:

> 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'.

ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: ubuntu-release-upgrader-core 1:25.04.18
ProcVersionSignature: Ubuntu 6.14.0-37.37-generic 6.14.11
Uname: Linux 6.14.0-37-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.32.0-0ubuntu5.3
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CrashReports:
 640:119:109:829331:2026-03-20 21:49:14.609329166 +0100:2026-03-20 21:49:12.367329290 +0100:/var/crash/_usr_bin_ibus-daemon.119.crash
 644:0:109:0:2026-03-20 22:23:56.765893217 +0100:2026-03-20 21:48:50.446330503 +0100:/var/crash/kdump_lock
 644:0:109:296:2026-03-20 22:23:58.220893246 +0100:2025-07-25 22:37:20.305502663 +0200:/var/crash/kexec_cmd
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 20 22:35:17 2026
InstallationDate: Installed on 2025-07-25 (238 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
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 plucky on 2026-03-20 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade plucky wayland-session

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https://bugs.launchpad.net/bugs/2145054

Title:
  Unresolvable problem while calculating the upgrade from Ubuntu 25.04
  to 25.10

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

Bug description:
  During upgrade, this error message pops up:

  > 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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: ubuntu-release-upgrader-core 1:25.04.18
  ProcVersionSignature: Ubuntu 6.14.0-37.37-generic 6.14.11
  Uname: Linux 6.14.0-37-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.32.0-0ubuntu5.3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CrashReports:
   640:119:109:829331:2026-03-20 21:49:14.609329166 +0100:2026-03-20 21:49:12.367329290 +0100:/var/crash/_usr_bin_ibus-daemon.119.crash
   644:0:109:0:2026-03-20 22:23:56.765893217 +0100:2026-03-20 21:48:50.446330503 +0100:/var/crash/kdump_lock
   644:0:109:296:2026-03-20 22:23:58.220893246 +0100:2025-07-25 22:37:20.305502663 +0200:/var/crash/kexec_cmd
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar 20 22:35:17 2026
  InstallationDate: Installed on 2025-07-25 (238 days ago)
  InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
  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 plucky on 2026-03-20 (0 days ago)
  VarLogDistupgradeTermlog:

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