Yesterday I tried a Kubuntu 9.04->9.10 upgrade. Today I downloaded a Kubuntu 9.10 install CD, because yet again, the upgrade broke something major.
Two hours of downloading a bit over 1 GB of packages was not the problem. The problem was that after the upgrade, sound was simply broken. The only way I could get the system to utter a peep was by playing back a DVD image. I initially thought it was the old "No sound in Flash videos" bug reborn, because that was one of the first things I tested. I spent about half an hour trying various fixed for that, reinstalling Flash etc. I then realized that I wasn't getting any sound in any app, apart from the noted exception with Kaffeine playing DVDs.
I also tried installing a newer version of ALSA, but I gave up when it wanted to do a 400+ MB download. Ridiculous. I must have stumbled on a poorly-written set of directions. Maybe it would work if I gave it another shot, but I'm not inclined to do so anytime soon.
My sound hardware is not anything exotic. I have both onboard sound, SoundMax HD using an Analog Devices 1988B chipset, and a Creative Audigy 2 ZS sound card. Both work fine in Kubuntu 9.04, including in games, such as Urban Terror. I can even use Teamspeak at the same time on the same device, something that was broken in Kubuntu 8.04 (whichever program I ran first would monopolize the sound device, for some reason). So I don't understand why sound broke when I upgraded to 9.10.
Fortunately, I had used Clonezilla to image my / partition before trying the upgrade, so it was easy to roll back to my 9.04 install.
While flailing about in 9.10 yesterday, I came across lots of comments on other forums from poor sods who'd had something similar happen to them after an upgrade. Has anyone found a fix for this "no sound after upgrade" problem?