[Bug 1960608] Re: python-pip >= 21.3.1+dfsg-3 fails pip3-root.sh autopkgtest with python3.10

[Stefano Rivera]

As I understand it, this is because pip expects the installation layouts
in sysconfig to be correct since Python 3.10. Previously it used the
layouts in distutils.sysconfig.

See:
* LP: #1940705
* LP: #1408092
* https://github.com/pypa/pip/pull/10358

The correct resolution here is to enable sysconfig-debian-schemes.diff
in Python 3.10. I'm not sure why this hasn't been enabled, yet.

** Also affects: python3.10 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: python3.10 (Ubuntu)
       Status: New => Confirmed

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Title:
  python-pip >= 21.3.1+dfsg-3 fails pip3-root.sh autopkgtest with
  python3.10

Status in python-pip package in Ubuntu:
  New
Status in python3.10 package in Ubuntu:
  Confirmed

Bug description:
  pip3-root.sh expects world package to be installed in
  /usr/local/lib/python3.*/dist-packages whereas it is actually
  installed into /usr/lib/python3.10/site-packages/.

  It even fails to uninstall the package right after installing it:

  ubuntu at autopkgtest:~$ sudo python3 -m pip install world
  Collecting world
    Using cached world-4.1.1-py3-none-any.whl
  Collecting atpublic
    Using cached atpublic-3.0.1-py3-none-any.whl (4.8 kB)
  Installing collected packages: atpublic, world
  Successfully installed atpublic-3.0.1 world-4.1.1
  WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
  ubuntu at autopkgtest:~$ sudo python3 -m pip uninstall world
  WARNING: Skipping world as it is not installed.
  WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv

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