My console:
desarrollador@desarrollador-HP-14-Notebook-PC1:~$ pip freeze
Exception:
Traceback (most recent call last):
File \"/usr/lib/python2.7/dist
Your pip may be outdated. Even in Ubuntu 14.04 LTS, the pip version it installed using apt-get install python-pip was 1.5.4. Try updating pip manually, and possibly the new packages again as well.
pip --version # 1.5.4
curl -O https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py
pip --version # 6.0.8
hash -r # reset bash cache
https://pip.pypa.io/en/latest/installing.html