That command attempts to install Django for the systemwide python. On
ubuntu this would require sudo(root) priveleges.
sudo pip install django
While that will work, I suspect most people would recommend you use
python virtualenv in order to create python sandboxes. The biggest
benefit is that you can have multiple django versions, each in their own
sandbox (great for testing and upgrades).
Here's a tutorial
http://www.jeffknupp.com/blog/2012/02/09/starting-a-django-project-the-right-way/
Enjoy,
Alex