BIP KB:
How To Install Mercurial Hg On Ubuntu 12.04 LTS

Introduction to Mercurial Hg Mercurial is a distributed version control and source code management system.

Installing Mercurial with apt-get is simple. SSH to your Pod, and run this command:

root@mypod:~# sudo apt-get install mercurial

That's it! It's really that simple.