Reboot (or at least run 'sudo alsa force-reload' ) and see if there's sound.
If not, give the updated alsa info:
https://wiki.ubuntu.com/Audio/AlsaInfo
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1231903
Title:
No sound output: Audio directed to Dummy
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