Comment 5 for bug 382473

Same problem with a fresh Karmic Koala installation: right Alt key has no effect.
VERY annoying as I'm typing French and German and I need special characters.

I once tried to set the "keyboard layout change" key to "both alt keys together" - but I don't know exactly if that's what triggered the bug to appear. On a fresh install right alt was ok, the bug "appeared" after some days.

The fix in comment #1 did NOT work for me, I'm left with a not-working right-alt key :-(