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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'

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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!

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In fact, I'm not sure about your question. but CompizConfig will help – loopum May 18 '12 at 17:13

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