原文地址:http://askubuntu.com/questions/133776/how-can-i-disable-alt-for-search
You can easily change the hotkey for the HUD by going to System Settings --> Keyboard --> Short-cuts as in the following picture :
enter image description here
Note that: Clicking ALT fast , shows the HUD. But When you click and hold you can use it easily for another function. I use ALT without any problems.