[Bug 2130511] [NEW] do-release-upgrade fails to continue to upgrade from Ubuntu 25.04 to 25.10

[A.J.]

Public bug reported:

do-release-upgrade fails to continue to upgrade from Ubuntu 25.04 to
25.10

Continue [yN] y
Get:1 Upgrade tool signature [833 B]                                           
Get:2 Upgrade tool [944 kB]                                                    
Fetched 944 kB in 0s (0 B/s)                                                   
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py:180: Warning: W:Download is performed unsandboxed as root as file 'questing.tar.gz.gpg' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
  result = fetcher.run()
authenticate 'questing.tar.gz' against 'questing.tar.gz.gpg' 
extracting 'questing.tar.gz'

...
...
...

Calculating the changes

Calculating the changes

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'. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree... Done 
Reading state information... Done

ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: ubuntu-release-upgrader-core 1:25.04.18
ProcVersionSignature: Ubuntu 6.14.0-35.35-generic 6.14.11
Uname: Linux 6.14.0-35-generic x86_64
ApportVersion: 2.32.0-0ubuntu5.3
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CrashReports:
 600:0:123:291737:2025-10-31 20:15:45.767676051 -0700:2025-10-31 20:16:15.535022526 -0700:/var/crash/libc6.0.crash
 600:0:123:1952786:2025-10-31 20:41:37.107538377 -0700:2025-10-31 20:41:37.098538209 -0700:/var/crash/apt-edsp.0.crash
CurrentDesktop: ubuntu:GNOME
Date: Sun Nov  2 01:45:29 2025
InstallationDate: Installed on 2022-03-31 (1311 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
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 2025-11-02 (0 days ago)

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


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

-- 
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https://bugs.launchpad.net/bugs/2130511

Title:
  do-release-upgrade fails to continue to upgrade from Ubuntu 25.04 to
  25.10

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

Bug description:
  do-release-upgrade fails to continue to upgrade from Ubuntu 25.04 to
  25.10

  Continue [yN] y
  Get:1 Upgrade tool signature [833 B]                                           
  Get:2 Upgrade tool [944 kB]                                                    
  Fetched 944 kB in 0s (0 B/s)                                                   
  /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py:180: Warning: W:Download is performed unsandboxed as root as file 'questing.tar.gz.gpg' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
    result = fetcher.run()
  authenticate 'questing.tar.gz' against 'questing.tar.gz.gpg' 
  extracting 'questing.tar.gz'

  ...
  ...
  ...

  Calculating the changes

  Calculating the changes

  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'. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree... Done 
  Reading state information... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: ubuntu-release-upgrader-core 1:25.04.18
  ProcVersionSignature: Ubuntu 6.14.0-35.35-generic 6.14.11
  Uname: Linux 6.14.0-35-generic x86_64
  ApportVersion: 2.32.0-0ubuntu5.3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CrashReports:
   600:0:123:291737:2025-10-31 20:15:45.767676051 -0700:2025-10-31 20:16:15.535022526 -0700:/var/crash/libc6.0.crash
   600:0:123:1952786:2025-10-31 20:41:37.107538377 -0700:2025-10-31 20:41:37.098538209 -0700:/var/crash/apt-edsp.0.crash
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Nov  2 01:45:29 2025
  InstallationDate: Installed on 2022-03-31 (1311 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  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 2025-11-02 (0 days ago)

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