How to set up apt-get on ubuntu

NOTE: Yum is designed for use on redhat-like systems using RPMs.
Ubuntu is based on debian, so uses apt-get/aptitude and .deb files.

On a fresh linux install:

• sudo apt-get update
• "You will have to enable the component called 'universe'": Go to System > Administration > Software Sources. Under the Ubuntu Software tab, tick the box for Community maintained Open Source Software (universe).
• sudo apt-get install XXX