Mobilefish.com - Replace Windows XP with Ubuntu 14.04 on a Dell Optiplex GX260 computer using an USB stick. Includes examples.
PC Dell Optiplex GX260, 2 Gb Ram, 120Gb Hard Drive, 2.4 ghz Intel Pentium 4 cpu, DVD Burner, Floppy Drive, Keyboard, Mouse, 15" LCD Monitor, Windows XP SP3 32-Bit, Turns On, As
Dell OptiPlex GX260 Hard Drive Replacement - iFixit Repair Guide