I ended up enjoying the UT2004 demo so much, I bought the full version. Having now installed it and played through a couple of the new maps, I can confirm that UT2004 is totally worth it.
Install Tips for Linux
Video Driver – Make sure you have a fairly new, if not the newest, version of the drivers for your video card. If you are using Fedora and have an Nvidia-based card, you can install a kernel module, as opposed to having to compile your own kernel. See my previous instructions for more details. The Nvidia kernel module updates sometimes lag the kernel updates, so you may have to wait a few days or longer for it to show up at livna.org.
Installing from CD – The UT2004 Disc 1 CD includes a shell script for installing the UT2004 binaries. Do not run it from the base directory for your CD-ROM drive. Otherwise, you will not be able to unmount the disc so that you can switch to the next disc.
Follow the prompts until you are asked to mount the Unreal Tournament 2004 Disc 2 CDROM. Then, open another terminal window, su to root, and unmount the cdrom drive. Press the physical eject button on your drive to eject the disc, insert disc 2, wait for it to come up to speed, and then click yes in the dialog.
Assuming that your cdrom drive is mounted at /mnt/cdrom:
$ su Password: # umount /mnt/cdrom
Repeat the unmount-mount process for each CD, when prompted by the install program.
After you complete the install from CD, download the most current patch for Linux. UnrealTower has good instructions for installing the patch.
Note that I didn’t need to use unmount (under Debian Sarge). I think the only thing you really should pay attention to is not to launch it from the base directory. Then UT will unmount itself.