Hmm, perhaps. I installed and run UT04 without using sudo / su root using the installer script located on the DVD (or cd depending on which you have). Note though that if you have the cd version, the "insert next cd" message can hide behind the installer window sometimes, so if it seems frozen, it's probably not. Just open up konsole, put in the installer disc, type sh and a space, and drag-n-drop the linux-install.sh or whatever file on the ut cd into konsole.. that's what I did
kind of lazy, but it works fine for me.