Hello, thanks for helping to make Ubuntu better.
There are already a few bugs that describe this behaviour (for example bug 
288039). I suggest you to try the solutions described in there and if that 
works mark this bug as a duplicate of the other bug.
Solution could be:
"alsamixer -Dhw" and set PCM to 80 or so and also see that the channel is not 
muted (MM) under a channel means it is muted and if it is muted press M to 
unmute.

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No sound after update on intel hda (82801H)
https://bugs.launchpad.net/bugs/304596
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