How can I reassign the <alt>-space keybinding?

Question

I use alt+space shortcut for Synapse.

I have reassigned the Activate Windows Menu from alt+space but cannot still receive an error

Failed to register hotkey 'activate' with signature 'space'

Answer 1

I just found how to do it: sudo apt-get install compizconfig-settings-manager Open it, then CompizConfig->general options->key bindings: window menu! disable it!