$ sudo pip install -U Sphinx
[sudo] password for vadi:
Requirement already up-to-date: Sphinx in /usr/local/lib/python2.7/dist-packages/Sphinx-1.3b1-py2.7.egg
Requirement already up-to-date: six>=1.4 in /usr/local/lib/python2.7/dist-packages (from Sphinx)
Requirement already up-to-date: Jinja2>=2.3 in /usr/local/lib/python2.7/dist-packages (from Sphinx)
Requirement already up-to-date: Pygments>=1.2 in /usr/local/lib/python2.7/dist-packages (from Sphinx)
Requirement already up-to-date: docutils>=0.10 in /usr/local/lib/python2.7/dist-packages (from Sphinx)
Requirement already up-to-date: snowballstemmer>=1.1 in /usr/local/lib/python2.7/dist-packages/snowballstemmer-1.2.0-py2.7.egg (from Sphinx)
Requirement already up-to-date: babel in /usr/local/lib/python2.7/dist-packages/Babel-1.3-py2.7.egg (from Sphinx)
Requirement already up-to-date: markupsafe in /usr/local/lib/python2.7/dist-packages (from Jinja2>=2.3->Sphinx)
Requirement already up-to-date: pytz>=0a in /usr/local/lib/python2.7/dist-packages (from babel->Sphinx)
Cleaning up...
I'm on Ubuntu 14.04 LTS.