I just installed ubuntu. things seems great but I have no sound. When I go to the settings menu I chose from various setup. I found one that work which had 4 speakers a subwofer and a front speaker. When I test it the sound works fine. However, when I try playing an *.mp3 file or try to watch a video on you tube I get no sound at all. I have a dual boot with windows XP and there is no problem in windows at all. Below is my setup.
OS: ubuntu 11.10 machine: dell dimension 8300 speakers: dell creative lab sounblaster live EMU10K1X video: ATI RADEON R350 [Radeon 9800 Pro] secondary
Following https://wiki.ubuntu.com/DebuggingSoundProblems did not help.