Solution to the sound problem: if you still have problems getting the sound to work on dosbox 0.74 or any other version, first of all do the things the comments above states, and do them from scratch, I mean everything from directory to installation. And last CHANGE THE SOUND IN GAME FROM DOSBOX, usually theres a "setsound,exe" file or similar, access it:
c mount /home/yourname/yourdosfolder
c:
cd yourgame
yourgame
setsound.exe
(ALWAYS START DOSBOX FROM TERMINAL)
Listen folks, I recently installed Ubuntu 11.04, hence first time ever using Linux, after a week of crashes and bugs, and so on, I finally got it working fine, and I'm loving it, it was all worthwhile for the cause - open source. And now It's all exlusive on my laptop, but man I tell you it was difficult installing and running ubuntu as the only OS, I do not recommend such attempts, but if you have several pc's around then by all mean D