You could turn your master volume up somewhat, as its set to 42%.
If that doesn't help, try installing linux-backports-modules-alsa-
karmic-generic and reboot.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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No sound after installing ubuntu 9.10 karmic koala beta linked to [Bug 440842]
https://bugs.launchpad.net/bugs/448188
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