Possible Duplicate:
How do I modify or disable the HUD's use of the Alt key?
In 12.04, the [Alt] key pops up the HUD. That's not a problem, but, when using [Alt]+... it pops up as well.
For instance on pushing [Alt]+[Left Arrow] which I use continually when navigating with Firefox (that's the 'back' functionality).
Is there a way to prevent this from happening?