Ubuntu 14.04 pip/setuptools/six Out of Date

[JSKenyon]

Ran into this while attempting to set up a virtualenv with --system-site-packages (for Meqtrees dependencies).

The dependency of tensorflow on six causes issues if six is out of date. It is well discussed here. I solved this by pointing my python path at /usr/local/lib/python2.7/dist-packages rather than /usr//lib/python2.7/dist-packages. There are other approaches mentioned in the link.

Additionally, it is necessary to update pip/setuptools/wheel outside the virtual environment, as inside the environment the will always resort to the system wide versions.