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Linux Gamers' FAQ (
http://www.icculus.org/lgfaq/ ):
Q: Even after specifying the CD path, UT still won't install, because it can't find the CD!
A: First of all, make sure the Joliet extensions are enabled in your kernel since the UT CD was burned using the Joliet extentions for the long filenames, and that you are using the correct installer for your CD. A quick test is to mount the UT CD and list the files on it. If the filenames are all 8 characters or less, and contain tildes (~), then you do not have the Joliet extentions enabled. You will need to recompile your kernel and/or modules to enable the Joliet extentions.
A: If you are running SuperMount or an auto-mounter, you may need to manually un-mount and re-mount the CD prior to pressing "Retry". You may also need to kill the associated daemons, to prevent them from confusing the CD detection.
This is my sick nature.