“In a recent video in the “Free Software” series, I showed you VirtualBox, which is a free and open source solution to be able to run other operating systems virtually on your PC. In this beginner’s guide, I will show you how to set-up and use VirtualBox. In addition, I’ll also show you how to install and run Ubuntu, which is one of the most popular of the Linux distributions”
Go to How to Use VirtualBox (Beginners Guide) for the description.