New answers tagged apple
Can you access a terminal from the log-in screen (CTRL+ATL+F1)? If so, you can try and reinstall the ubuntu-desktop package: sudo apt-get install ubuntu-desktop If that doesn't work, try uninstalling/reinstalling the proprietary drivers - presumably this is a nvidia issue. Part of this thread (14) details the necessary steps.
I'm not sure this will work with Magic Mouse, but with Magic Trackpad I successfully used xSwipe to get browser back / forward navigation, workspace switch, Scale and Expo actions.
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