How can I change the default Unity keyboard shortcut?

  1. Install compizconfig-settings-manager Ubuntu Software Center.

  2. Go to 'Unity Plugin', choose General tab (the default tab)

  3. Change Key to open the first panel menu as you like to free your shortcut:

    enter image description here

Some more key bindings are in General Options, tab Key bindings. I was using CCSM 0.9.11.2, in future versions of CCSM these options can change.