I was having the same problem with mounting the cdRom and got UT (2000) ut-428-install.run to work by:
bash$ ---> switching to root,
No problems installing this way using that export command.
But now I am getting an error saying it cannot find the file 'Entry'.... so off to figure out wtf is up with this.
Oh and Electro --> you can find them at www.lokigames.com
or if you just search for linux installs of your game of choice you might find them. One thing about the UT disc. If you are like me and have a version that came with my SoundBlaster card, then you have to install version 428, then upGrade to the noDelta-436 version. UT2k3 I am not sure because I havent installed it.