This tutorial shows how you can set up an Ubuntu 8.10 (Intrepid Ibex) desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge.
I want to say first that this is not the only way of setting up such a system. There are many ways of achieving this goal but this is the way I take. I do not issue any guarantee that this will work for you!
The Perfect Desktop - Ubuntu 8.10 (Intrepid Ibex) | HowtoForge - Linux Howtos and Tutorials