There were a few bugs the past days about missing sound. Just by chance:
Can you enable sound again by setting PCM in "alsamixer -Dhw" to 100 or so? And 
are you sure every channel is unmuted? (MM) under a channel means that it is 
muted, you unmute with the key M . Also you try a "alsactl restore".

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No sound since upgrade to 8.10
https://bugs.launchpad.net/bugs/305742
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