Ubuntu is an open source software platform that runs everywhere from the smartphone, the tablet and the PC to the server and the cloud.
How to install Ubuntu :
Download the Ubuntu ISO from http://www.ubuntu.com/getubuntu/download and save to your desktop
Burn the ISO image to a blank CD/DVD using freeisoburner
Download UnetBootin. UNetbootin allows for the installation of various Linux/Ubuntu distributions to a partition or USB drive.