I was just looking through my previous posts, and noticed this one. I did manage to get the sound working after a while and a bunch of messing around and reinstalling.
Here is how you have to do it:
Install Ubuntu first.
Then type in sudo apt-get install kde, to install kde.
Then open up Kmix under kde, and disable the external amplifier switch.
I know this sounds like a crazy way to do it, and there probably is an easier way, but I havn't found it. I tried just installing kubuntu, and disabling the external amplifier switch, and that didn't work. I also tried disabling the axternal amplifier switch under ubuntu, but that doesn't work either.
Hope this helps someone.