I had this same problem when I didn't have my drivers for the Graphic
card installed right. I would try to reinstall them if that doesn't work
post it on the bug website so I can see it didn't work and can help you
more.
rowbgcolor=lightgreen
** Changed in: ubuntu
Status: New => Confirmed
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sound volume keys don't work
https://bugs.launchpad.net/bugs/354719
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