[Bug 2148276] Re: Subiquity crash in postinstall: TypeError in run_unattended_upgrades (lambda missing argument) on Ubuntu 26.04 beta

[Olivier Gayot]

*** This bug is a duplicate of bug 2146446 ***
    https://bugs.launchpad.net/bugs/2146446

** This bug has been marked a duplicate of bug 2146446
   /usr/bin/unattended-upgrade: TypeError: install_or_postpone.<locals>.run_in_thread.<locals>.<lambda>() missing 1 required positional argument: '_'

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Title:
  Subiquity crash in postinstall: TypeError in run_unattended_upgrades
  (lambda missing argument) on Ubuntu 26.04 beta

Status in subiquity:
  New
Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  Installer crashes after "All upgrades installed" during postinstall
  stage with:

  TypeError: lambda() missing 1 required positional argument: '_'

  
  step to reproduce
  1. Boot Ubuntu 26.04 beta ISO
  2. Run autoinstall

  Details log:
  Apr 14 14:16:32 ubuntu subiquity_log.4457[25834]: All upgrades installed
  Apr 14 14:16:32 ubuntu subiquity_log.4457[25834]: TypeError:
  install_or_postpone.<locals>.run_in_thread.<locals>.<lambda>() missing 1 required positional argument: '_'

  Apr 14 14:16:32 ubuntu subiquity_log.4457[25834]: Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 238, in partial_apport_excepthook
      return apport_excepthook(binary, exc_type, exc_obj, exc_tb)
    File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 117, in apport_excepthook
      report.add_proc_info(extraenv=["PYTHONPATH", "PYTHONHOME"])

    File "/usr/lib/python3/dist-packages/apport/report.py", line 802, in add_proc_info
      - ExecutablePath: /proc/pid/exe contents; if the crashed process is

  ValueError: /usr/bin/python3.14 (deleted) does not exist

  Original exception was:
  TypeError:
  install_or_postpone.<locals>.run_in_thread.<locals>.<lambda>() missing 1 required positional argument: '_'

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