[Bug 2128839] [NEW] Error message while upgrading to Lubuntu 26.04

[Guybrush88]

Public bug reported:

I got this error message while trying to update Lubuntu from 25.10 to
26.04, after aborting the operation after being notified that I
installed some software from an external repo

<sys>:0: Warning: g_main_context_pop_thread_default: assertion 'stack !=
NULL' failed

(resolute:3236): GLib-CRITICAL **: 20:10:15.347:
g_main_context_pop_thread_default: assertion 'stack != NULL' failed

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: ubuntu-release-upgrader-core 1:25.10.8
ProcVersionSignature: Ubuntu 6.17.0-5.5-generic 6.17.0-rc7
Uname: Linux 6.17.0-5-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: LXQt
Date: Fri Oct 17 20:20:08 2025
InstallationDate: Installed on 2025-09-09 (38 days ago)
InstallationMedia: Lubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to questing on 2025-10-17 (0 days ago)
VarLogDistupgradeTermlog:

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


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

** Summary changed:

- Error message while upgrading to 26.04
+ Error message while upgrading to Lubuntu 26.04

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https://bugs.launchpad.net/bugs/2128839

Title:
  Error message while upgrading to Lubuntu 26.04

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

Bug description:
  I got this error message while trying to update Lubuntu from 25.10 to
  26.04, after aborting the operation after being notified that I
  installed some software from an external repo

  <sys>:0: Warning: g_main_context_pop_thread_default: assertion 'stack
  != NULL' failed

  (resolute:3236): GLib-CRITICAL **: 20:10:15.347:
  g_main_context_pop_thread_default: assertion 'stack != NULL' failed

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: ubuntu-release-upgrader-core 1:25.10.8
  ProcVersionSignature: Ubuntu 6.17.0-5.5-generic 6.17.0-rc7
  Uname: Linux 6.17.0-5-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: LXQt
  Date: Fri Oct 17 20:20:08 2025
  InstallationDate: Installed on 2025-09-09 (38 days ago)
  InstallationMedia: Lubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to questing on 2025-10-17 (0 days ago)
  VarLogDistupgradeTermlog:

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