In my previous post I wrote about a strange bahavior of my freshly installed Ubuntu. One of the problems was related to sound. I managed to get it working. It came out that something had muted the PCM channel of my sound card. ( while updating from Ubuntu 8.04)
You can fix it by right clicking on the “Sound” icon next to menu bar, choosing “Open Volume Control” and moving up the slider next to PCM label.
I read on some boards that it’s a common issue on Ubuntu 8.10, and quite a lot of people had problems with that. I hopy that this “silly” solution might help someone.