Is this your problem?
https://bugs.launchpad.net/ubuntu/+source/python-defaults/+bug/989856
Seems to be caused by running it in a virtual environment, and there is a work around.
BTW this was the top result in google.
Is this your problem?
https://bugs.launchpad.net/ubuntu/+source/python-defaults/+bug/989856
Seems to be caused by running it in a virtual environment, and there is a work around.
BTW this was the top result in google.