[Bug 2153278] Re: software-properties-gtk cannot show drivers

[Charles]

*** This bug is a duplicate of bug 2150181 ***
    https://bugs.launchpad.net/bugs/2150181

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Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 2150181, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
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find.

** This bug has been marked a duplicate of bug 2150181
   [SRU] software-properties-gtk driver detection fails with Python 3.14 (cannot pickle SoftwarePropertiesGtk)

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https://bugs.launchpad.net/bugs/2153278

Title:
  software-properties-gtk cannot show drivers

Status in software-properties package in Ubuntu:
  Confirmed

Bug description:
  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 at 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)

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