TDF - Do the Ubuntu on a live CD and load it in and play around, think you screwed it up? Reboot.
Haven't played with Fedora after 4 but have run SUSE 10X and this server is actually CentOS . Thinking of a new server and it will likely be Cent or RHEL
On a side note, get the Linux running on top of a virtual machine. Don't like it, trash it and start anew
