Disable the HUD when pressing the ALT key
When you install Ubuntu, lots of keyboard shortcuts are pre-configured. Some of them are very useful but one of them annoyed me. The ALT one!
Either when I am in the terminal, playing games or using other applications I need to use the ALT key and the HUD popups up.
So here's how to disable it:
In the system settings, click on the keyboard
settings, then the shortcuts
tab. Now click on the Key to show the HUD
and then you can set up your own shortcut.

Command line
gconftool-2 --set "/apps/compiz-1/plugins/unityshell/screen0/options/show_hud" --type string "<Alt>l"
This will set up the HUD to be ALT+L
To verify, you can use the get
:
gconftool-2 --get "/apps/compiz-1/plugins/unityshell/screen0/options/show_hud"