Re: Disable ALT + Right Click menu
Are you talking about the HUD?
I can't reproduce your problem: The HUD only comes up when I tap Alt, not when I hold it down to do Alt-Rightclick. If I change the HUD's keyboard combination to Control-Alt, then only tapping Control-Alt will make it appear. Alt on its own will not.
I'm on 12.04 too, with Compizconfig Settings Manager.
Have you tried totally removing the keyboard combination for Show The HUD, instead of just changing it?
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.