I am affected too but I did dist-upgrade from 09.10. It is a regression for me.
'~$ uname -a; Linux T43 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 
2010 i686 GNU/Linux'
After a reboot alsamixer shows the Master volume control muted. De-muting it 
and advancing this volume control solves the problem for me.

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Sound mute by default on fresh installation
https://bugs.launchpad.net/bugs/574513
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