Comment 0 for bug 1864995

I tried to debug a gnome-shell crash in Ubuntu 20.04, but unfortunately apport-retrace is unable to build a sandbox, it fails with urllib.error.HTTPError: HTTP Error 404: Not Found, here is the whole cmd:

user@ubuntu:~$ apport-retrace -R --sandbox system --cache /var/crash/sandbox/ --stdout /var/crash/_usr_bin_gnome-shell.1000.crash
Traceback (most recent call last):
  File "/usr/bin/apport-retrace", line 322, in <module>
    sandbox, cache, outdated_msg = apport.sandboxutils.make_sandbox(
  File "/usr/lib/python3/dist-packages/apport/sandboxutils.py", line 220, in make_sandbox
    pkgs = needed_runtime_packages(report, sandbox_dir, pkgmap_cache_dir, pkg_versions, verbose)
  File "/usr/lib/python3/dist-packages/apport/sandboxutils.py", line 92, in needed_runtime_packages
    pkg = apport.packaging.get_file_package(l, True, pkgmap_cache_dir,
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 490, in get_file_package
    return self._search_contents(file, map_cachedir, release, arch)
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 1324, in _search_contents
    src = urlopen(url)
  File "/usr/lib/python3.8/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/lib/python3.8/urllib/request.py", line 640, in http_response
    response = self.parent.error(
  File "/usr/lib/python3.8/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found