Ubuntu 5.04 passed end of life many years ago (October 2006). Please try an current version of Ubuntu!
I would recommend 12.04 LTS (long time support), and do not limit your choice to the standard Ubuntu version, try also Lubuntu, Xubuntu and Kubuntu, that have the same engine under the hood but different desktop environments (what it looks and feels like).
Edit: If you really want 5.04, try it in old hardware or an old version of a virtual machine.
^ Lubuntu |
| Xubuntu |
| Ubuntu |
| Kubuntu v