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

[Anders Kaseorg]

This new sysconfig-debian-schemes.diff has broken virtual environments
(venv and virtualenv). Please take a look at the fix in
https://bugs.launchpad.net/ubuntu/+source/python3.10/+bug/1962791.

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https://bugs.launchpad.net/bugs/1960608

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

Status in automake-1.16 package in Ubuntu:
  Fix Released
Status in dh-python package in Ubuntu:
  Fix Released
Status in python-pip package in Ubuntu:
  Fix Released
Status in python3.10 package in Ubuntu:
  Fix Released

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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