I had the same problem with feisty and solved it. 
I have 2 sound cards, and it seems that sometimes the wrong sound card is the 
default sound device.

$ sudo asoundconf list
Names of available sound cards:
Intel
CA0106

The first one is integrated on the motherboard, and the second one (an
audigy) is the one I use.

To solve the problem, I just set the default sound card to the audigy:
$ sudo asoundconf set-default-card CA0106

Then the sound works !
Hope it helps.

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Sound doesn't work after restart, only works on cold boot
https://bugs.launchpad.net/bugs/57141
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