Thank for your report.
Can you see here to try to solve your problem:
https://wiki.ubuntu.com/DebuggingSoundProblems
Can you give the result of:
uname -a
cat /proc/asound/cards
dmesg > dmesg.log
sudo lspci -vvnn > lspci-vvnn.log
** Changed in: linux (Ubuntu)
Sourcepackagename: None => linux
Status: New => Incomplete
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Sound not working after recent insall of latest Ubuntu
https://bugs.launchpad.net/bugs/291502
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