running Ubuntu from disc and no sound whatsoever

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http://www.linuxquestions.org – Hi, I am new to this. my son has installed Ubuntu 10.04 on his computer and is very happy with it and has suggested that I should try it myself on one of my computers. So I borrowed a disc from him and ran Ubuntu from the DVD ROM drive and ran it to try it, that is I didn't install it. it booted up okay to the user interface screen and although slow, everything seems to work except for sound, I have no sound whatsoever on the computer although it has sound when I switch back to Windows. I tried to play an mp3 music disc an also downloaded an mp3 file from the net to see if that would work but (HowTos)