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 80 or so?
And unmute the channels, if it is muted. You see that it is muted, if a |MM| is
under the channel and unmute with the key M. Also you try an "alsactl restore".
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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No sound in ubuntu, tried all guides I could find and nothing works
https://bugs.launchpad.net/bugs/304888
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