Are you sure that it ain't recognized, but missing the sound? If that's the case, you'll need to install alsaguimixer and turn the sound on. unfortunately Ubuntu don't seem to do this by default. This is how I solved the "no-sound" problem with my SB Audigy 2 ZS (24 bit).
But, I had to re-install the alsaguimixer to get it to work - the one that was installed did not work
I would guess it is something like
apt-get remove alsaguimixer
apt-get install alsaguimixer
But if you're right, and it's not recognizing the card at all - I'm to much rookie for that problem