[Bug 2098615] [NEW] command-not-found database update (cnf-update-db) crashes with a Python refcount error in apt_pkg on Ubuntu 24.04

[Ulrik]

Public bug reported:

Running /usr/lib/cnf-update-db on Ubuntu 24.04 results in a Python crash
with the following error:

Fatal Python error: none_dealloc: deallocating None: bug likely caused by a refcount error in a C extension
Python runtime state: initialized

Current thread 0x00007fdd70bdf080 (most recent call first):
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 201 in _parse_single_commands_file
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 143 in _fill_commands
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 96 in create
  File "/usr/lib/cnf-update-db", line 32 in <module>

Extension modules: apt_pkg (total: 1)
Aborted
Reinstalling command-not-found, python3-commandnotfound, and python3-apt does not resolve the issue.
This appears to be a regression in Ubuntu 24.04.

Steps to Reproduce:

Run:
sudo /usr/lib/cnf-update-db
Observe the crash.
Expected Behavior:
The command should update the command-not-found database without errors.

Workaround Attempted:

Reinstalling command-not-found, python3-commandnotfound, and python3-apt
Running the script manually in Python's debugger (pdb)
Issue persists across reinstalls

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: command-not-found 23.04.0
Uname: Linux 5.15.167.4-microsoft-standard-WSL2 x86_64
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Sun Feb 16 19:57:38 2025
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: command-not-found
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: command-not-found (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble wayland-session

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https://bugs.launchpad.net/bugs/2098615

Title:
  command-not-found database update (cnf-update-db) crashes with a
  Python refcount error in apt_pkg on Ubuntu 24.04

Status in command-not-found package in Ubuntu:
  New

Bug description:
  Running /usr/lib/cnf-update-db on Ubuntu 24.04 results in a Python
  crash with the following error:

  Fatal Python error: none_dealloc: deallocating None: bug likely caused by a refcount error in a C extension
  Python runtime state: initialized

  Current thread 0x00007fdd70bdf080 (most recent call first):
    File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 201 in _parse_single_commands_file
    File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 143 in _fill_commands
    File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 96 in create
    File "/usr/lib/cnf-update-db", line 32 in <module>

  Extension modules: apt_pkg (total: 1)
  Aborted
  Reinstalling command-not-found, python3-commandnotfound, and python3-apt does not resolve the issue.
  This appears to be a regression in Ubuntu 24.04.

  Steps to Reproduce:

  Run:
  sudo /usr/lib/cnf-update-db
  Observe the crash.
  Expected Behavior:
  The command should update the command-not-found database without errors.

  Workaround Attempted:

  Reinstalling command-not-found, python3-commandnotfound, and python3-apt
  Running the script manually in Python's debugger (pdb)
  Issue persists across reinstalls

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: command-not-found 23.04.0
  Uname: Linux 5.15.167.4-microsoft-standard-WSL2 x86_64
  ApportVersion: 2.28.1-0ubuntu3.3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Sun Feb 16 19:57:38 2025
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: command-not-found
  UpgradeStatus: No upgrade log present (probably fresh install)

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