/usr/share/apport/whoopsie-upload-all:FileNotFoundError:/usr/share/apport/whoopsie-upload-all@220:main:collect_info:process_report:add_package_info:add_package:get_version:_apt_pkg:_cache:__init__:_check_and_create_required_dirs:makedirs:makedirs

[errors.ubuntu.com bug bridge]

```
Traceback (most recent call last):
  File "/usr/share/apport/whoopsie-upload-all", line 220, in <module>
    main()
  File "/usr/share/apport/whoopsie-upload-all", line 202, in main
    stamps = collect_info()
  File "/usr/share/apport/whoopsie-upload-all", line 150, in collect_info
    res = process_report(r)
  File "/usr/share/apport/whoopsie-upload-all", line 90, in process_report
    r.add_package_info()
  File "/usr/lib/python3/dist-packages/apport/report.py", line 351, in add_package_info
    version = self.add_package(package)
  File "/usr/lib/python3/dist-packages/apport/report.py", line 320, in add_package
    version = packaging.get_version(package)
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 163, in get_version
    pkg = self._apt_pkg(package)
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 156, in _apt_pkg
    return self._cache()[package]
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 121, in _cache
    self._apt_cache = apt.Cache(progress, rootdir='/')
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 143, in __init__
    self._check_and_create_required_dirs(rootdir)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 183, in _check_and_create_required_dirs
    os.makedirs(rootdir + d)
  File "/usr/lib/python3.10/os.py", line 215, in makedirs
    makedirs(head, exist_ok=exist_ok)
  File "/usr/lib/python3.10/os.py", line 225, in makedirs
    mkdir(name, mode)
FileNotFoundError: [Errno 2] No such file or directory: '//var/cache/apt/archives'
```

The Ubuntu Error Tracker has been receiving reports about a problem regarding apport. This problem was most recently seen with package version 2.20.11-0ubuntu82.2, the problem page at https://errors.ubuntu.com/problem/e3a000aa8a314f9ae9303dcd52a119799a00496f contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Benjamin Drung (bdrung)]

`apt.Cache(progress, rootdir='/')` fails with `FileNotFoundError`. I consider it a bug in python-apt. If the caller should catch that failure, please document that in python-apt and assign back to apport.