"pkg-resources=0.0.0" in "requirements.txt"

[NausX]

That line was causing me issue. I tried reinstalling and deleting bunch of stuff and only once I decided to remove the line from the requirement.txt file, make mk_venv worked as expected.

I was still wondering as I couldn't find that package at all. Then I dug deeper to find that, apparently, the line is generated by pip freeze when in a virtualenv on some systems i.e. Ubuntu and Debian. It seems those systems separate the pkg_resources from setuptools and add it as a package. According to that, what I can guess is that there is no special case for pip freeze and thus the "package" of pkg-resources appears in the resulting output.

pypa/pip#4022
pypa/pip#4668

I don't know if it's the case of who generated the requirement.txt file as those bugs are 1y old. But still, as a workaround you can remove that line if you're not using Debian or Ubuntu.

[humenda]

Thanks for the report. It seems as if this was even not strictly required on a Debian/Ubuntu system, so I remove it. If you find any other issues, let us know.