Public bug reported:
software-properties-gtk crashes with TypeError: cannot pickle
'SoftwarePropertiesGtk' object when opening the Additional Drivers tab.
This happens due to Python 3.14 changing the default multiprocessing
start method. The detect_drivers thread tries to start a subprocess
using forkserver, which requires pickling a GTK object — which fails.
Workaround: force fork start method before self.search_process.start()
Error:
jao@jao-Legion-Slim-5-16IRH8:~$ software-properties-gtk 2>&1
Exception in thread Thread-1 (detect_drivers):
Traceback (most recent call last):
File "/usr/lib/python3.14/threading.py", line 1082, in _bootstrap_inner
self._context.run(self.run)
~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "/usr/lib/python3.14/threading.py", line 1024, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
line 1458, in detect_drivers
self.search_process.start()
~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/lib/python3.14/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
~~~~~~~~~~~^^^^^^
File "/usr/lib/python3.14/multiprocessing/context.py", line 230, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/context.py", line 306, in _Popen
return Popen(process_obj)
File "/usr/lib/python3.14/multiprocessing/popen_forkserver.py", line 35, in
__init__
super().__init__(process_obj)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/popen_fork.py", line 20, in __init__
self._launch(process_obj)
~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/popen_forkserver.py", line 47, in
_launch
reduction.dump(process_obj, buf)
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
TypeError: cannot pickle 'SoftwarePropertiesGtk' object
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: software-properties-gtk 0.120
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue May 19 17:26:39 2026
InstallationDate: Installed on 2026-05-18 (1 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
PackageArchitecture: all
ProcEnviron:
LANG=pt_BR.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: software-properties (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2153278
Title:
software-properties-gtk cannot show drivers
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