Hi all,
I cannot produce sound from my system
Did you just install Ubuntu?
Are you sure your speakers work? Have you tested another set of speakers or headphones?
Make sure you don't have the sound muted. Double click the speaker icon in the upper right hand corner of your screen. Make sure all of your levels are turned up.
If you think this might be a driver issue, open terminal and do
find /lib/modules/`uname -r` | grep snd
Tell us what output, if any, that command produces.