Thank you for your bug report. We'll need some more information to be
able to reproduce and resolve this issue:

1. Does sound work in any application at all, or is the lack of sound
limited to mplayer and rhythmbox?

2. Has sound ever worked for you on this install of Ubuntu, or did
something recently change that caused the sound to stop working? If so,
what changed at that time?

3. Do you know what model sound card you have? If you don't know the
specific model, is it an internal card? USB? etc.

4. Try going to System->Preferences->Sound and see if any sound cards
are detected there.

Finally, this sound troubleshooting guide may help if this is simply a
configuration issue:

http://ubuntuforums.org/showthread.php?t=205449

-- 
could not open audio device
https://bugs.launchpad.net/bugs/332988
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