I installed the update from the official site, and now on exit this comes out:
[ocer@odin ~]$ ut2004
WARNING: ALC_EXT_capture is subject to change!
Xlib: extension "XiG-SUNDRY-NONSTANDARD" missing on display ":0.0".
Don't think it's got anything to do with the sound though. Game still apparantly works fine, exept the slow motion audio