Before you attempt any change on your system, could you check first that your sound isn't simply muted? Run the commands alsaconf
. And there should be something like "volume control" in System > Preferences
, or simply by double-clicking on the speaker icon on your desktop)
If your sound is not muted, there are two links that I can suggest to you. The first one:
suggests the upgrade of ALSA to the most recent version. It might work for your card. The second one:
Is a much more detailed HOWTO for fixing various sound problems on Ubuntu. It's a fairly long read but it's worth going through it; especially "Manually Specify Module Parameters", in case upgrading ALSA doesn't do the trick.