As I mentioned before, sound stopped working when I upgraded from Feisty Fawn to Gutsy Gibbon. I have the Intel 82801H (ICH8 Family) HD Audio Controller. I tried to get it working a few different ways, all following suggestions from various Ubuntu forum and launchpad websites (yes, this seems to be a well known bug), but what finally worked was "Method B" found on this page. Phew! To celebrate I watched some videos on YouTube. They are much better when you can hear 'em.