In this follow up to Replace the Retiring Windows XP with Linux we're going learn the easiest and most foolproof way to install and run Xubuntu Linux 12.04 LTS on your old Windows XP computer. The only requirements are that your old computer has USB ports, and that it supports booting from a USB stick. If your computer is too old for USB, then it's pretty darned old and you really need to think about getting a newer one. There are but four steps: one, go to OSDisc.com and order Xubuntu Linux on a 32-gigabyte USB stick. Then insert the USB stick into your computer,...