[Bug 2146811] [NEW] Upgrade from 25.10 ro 26.04 fails

[Stephen]

Public bug reported:

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'. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree... Done 
Reading state information... Done
=== Command detached from window (Mon Mar 30 16:34:48 2026) ===
=== Command terminated with exit status 1 (Mon Mar 30 16:34:58 2026) ===

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: ubuntu-release-upgrader-core 1:25.10.8
ProcVersionSignature: Ubuntu 6.17.0-19.19-generic 6.17.13
Uname: Linux 6.17.0-19-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Mon Mar 30 16:35:53 2026
InstallationDate: Installed on 2025-04-18 (346 days ago)
InstallationMedia: Kubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to questing on 2026-03-30 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/2146811

Title:
  Upgrade from 25.10 ro 26.04 fails

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

Bug description:
  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'. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree... Done 
  Reading state information... Done
  === Command detached from window (Mon Mar 30 16:34:48 2026) ===
  === Command terminated with exit status 1 (Mon Mar 30 16:34:58 2026) ===

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: ubuntu-release-upgrader-core 1:25.10.8
  ProcVersionSignature: Ubuntu 6.17.0-19.19-generic 6.17.13
  Uname: Linux 6.17.0-19-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Mon Mar 30 16:35:53 2026
  InstallationDate: Installed on 2025-04-18 (346 days ago)
  InstallationMedia: Kubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to questing on 2026-03-30 (0 days ago)

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