Install error from bad python3-distutils on Ubuntu 20.04 and Python 3.9

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 20.04.5 (focal)

• Poetry version: 1.2.0

• Link of a Gist with the contents of your pyproject.toml file: D/C

Issue

Running:

$ curl -sSL https://install.python-poetry.org | python3 -
Retrieving Poetry metadata

# Welcome to Poetry!

This will download and install the latest version of Poetry,
a dependency and package manager for Python.

It will add the `poetry` command to Poetry's bin directory, located at:

/home/user/.local/bin

You can uninstall at any time by executing this script with the --uninstall option,
and these changes will be reverted.

Installing Poetry (1.2.0): An error occurred. Removing partial environment.
Poetry installation failed.
See /home/user/poetry-installer-error-017x_k1p.log for error logs.

Traceback on log:

Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/__main__.py", line 29, in <module>
    from pip._internal.cli.main import main as _main
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/cli/main.py", line 9, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 10, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 8, in <module>
    from pip._internal.cli import cmdoptions
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/cli/cmdoptions.py", line 24, in <module>
    from pip._internal.cli.parser import ConfigOptionParser
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/cli/parser.py", line 12, in <module>
    from pip._internal.configuration import Configuration, ConfigurationError
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/configuration.py", line 26, in <module>
    from pip._internal.utils.logging import getLogger
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/utils/logging.py", line 29, in <module>
    from pip._internal.utils.misc import ensure_dir
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/utils/misc.py", line 42, in <module>
    from pip._internal.locations import get_major_minor_version
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/locations/__init__.py", line 67, in <module>
    from . import _distutils
  File "/home/user/.local/share/pypoetry/venv/lib/python3.8/site-packages/pip/_internal/locations/_distutils.py", line 20, in <module>
    from distutils.cmd import Command as DistutilsCommand
ModuleNotFoundError: No module named 'distutils.cmd'

Traceback:

  File "<stdin>", line 892, in main
  File "<stdin>", line 528, in run
  File "<stdin>", line 549, in install
  File "/usr/lib/python3.8/contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "<stdin>", line 621, in make_env
  File "<stdin>", line 607, in make_env
  File "<stdin>", line 339, in make
  File "<stdin>", line 362, in pip
  File "<stdin>", line 359, in python
  File "<stdin>", line 352, in run

Comienza reproduciendo el comando curl -sSL https://install.python-poetry.org | python3 - en Ubuntu 20.04; después, inspecciona la ruta del instalador que crea el entorno e invoca pip, usando el traceback proporcionado como punto del fallo. Se considera completado cuando el instalador finaliza correctamente sin el fallo ModuleNotFoundError: No module named 'distutils.cmd'.