Ubuntu Packages - How to install gmpy on python

Know about Ubuntu Nickname
It depends on your Version on your Ubuntu, here some version of Ubuntu with their Nickname
Ubuntu 14.10 (Utopic)
Ubuntu 14.04.2 LTS (Trusty)
Ubuntu 12.04.5 LTS (Precise)
Ubuntu 10.04.4 LTS (Lucid)
You can find a more complete reference here
http://releases.ubuntu.com/

Check Ubuntu Version
To check your Ubuntu version
 lsb_release -a

Download your installer according to your Version
I am using precise, so I install it from here
http://packages.ubuntu.com/precise/math/python-gmpy

Search your package here [There is a search engine down the page]:
http://packages.ubuntu.com/

Install the installer
To install a deb package
sudo dpkg -i DEB_PACKAGE
http://askubuntu.com/questions/40779/how-do-i-install-a-deb-file-via-the-command-line