The issue is that virtualenv bundles pip 8.1.1, which doesn't know about
python_version. It then tries to upgrade to the latest pip and
setuptools, but that version isn't Python 3.5 compatible.
If you build the virtualenv with --no-download, or use venv instead of
virtualenv, you'll get just pip 8.1.1, and setuptools 20.7.0. You can
then explicitly upgrade them to setuptools < 51.3, as you describe.
We could add a hack to virtualenv to specify the setuptools < 51.3 restriction.
But given Ubuntu 18.04 is almost EOL, I'm tempted to just leave this one be. It
has a workaround...
** Changed in: python-virtualenv (Ubuntu)
Status: New => Fix Released
** Also affects: python-virtualenv (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1912248
Title:
virtualenv on xenial: easy_install syntax error
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