I was getting a similar error on 16.04 by running "python -m pip", but *not* when running "pip" directly. Upgrading CFFI per comment #3 fixed it.
This is with a system upgraded from Trusty (and before) in case that matters.
I was getting a similar error on 16.04 by running "python -m pip", but *not* when running "pip" directly. Upgrading CFFI per comment #3 fixed it.
This is with a system upgraded from Trusty (and before) in case that matters.