Public bug reported:
Tested on focal with both the focal-proposed 3.9.0-1~20.04 amd64 and
focal-updates 3.9.0~rc1-1~20.04 amd64 packages.
Installed python3.9 (+deps) and python3.9-venv
$ python3.9 -m venv venv
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
apt-get install python3-venv
You may need to use sudo with that command. After installing the python3-venv
package, recreate your virtual environment.
Failing command: ['/home/ziddey/test/venv/bin/python3.9', '-Im',
'ensurepip', '--upgrade', '--default-pip']
$ python3.9 -m ensurepip --version
/usr/bin/python3.9: Error while finding module specification for
'ensurepip.__main__' (ImportError: cannot import name '_bundled' from partially
initialized module 'ensurepip' (most likely due to a circular import)
(/usr/lib/python3.9/ensurepip/__init__.py))
vs:
$ python3.8 -m ensurepip --version
pip 20.0.2
Adding --without-pip works to create the venv, but obviously without pip.
Comparing /usr/lib/python3.9/ensurepip/__init__.py with the official
cpython, it looks like we don't bundle. Instead, we use common python
wheels in /usr/share/python-wheels/. This means that python3.9 would end
up sharing the same wheels as python3.8.
By commenting out:
from . import _bundled
everything seems to work fine. venv creates/activates, pip seemingly
works as expected, despite being an older version. Or at least, it works
well enough to create the venv with --upgrade-deps so that the venv will
then take on current versions instead.
Of course, this relies on having the wheels available via python3.8 and
having them be compatible, but it's a temporary fix.
$ python3.9 -m venv --upgrade-deps venv
Collecting pip
Downloading pip-20.2.3-py2.py3-none-any.whl (1.5 MB)
|████████████████████████████████| 1.5 MB 2.8 MB/s
Collecting setuptools
Downloading setuptools-50.3.1-py3-none-any.whl (785 kB)
|████████████████████████████████| 785 kB 17.3 MB/s
Installing collected packages: pip, setuptools
Attempting uninstall: pip
Found existing installation: pip 20.0.2
Uninstalling pip-20.0.2:
Successfully uninstalled pip-20.0.2
Attempting uninstall: setuptools
Found existing installation: setuptools 44.0.0
Uninstalling setuptools-44.0.0:
Successfully uninstalled setuptools-44.0.0
Successfully installed pip-20.2.3 setuptools-50.3.1
ziddey@laurie:~/test$ . venv/bin/activate
(venv) ziddey@laurie:~/test$ pip list
Package Version
------------- -------
pip 20.2.3
pkg-resources 0.0.0
setuptools 50.3.1
** Affects: python3.9 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1900211
Title:
venv creation fails: ensurepip error
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