Please try updating your alsa drivers, as outlined here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules. Please
report back as to whether this helps solve your issue.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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Soundcard not detected. Sound is onboard. I have no sound now that I have new
hardware. (In Windows I have sound.)
https://bugs.launchpad.net/bugs/660437
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