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I just noticed that the HUD appears to be gone. I updated to 13.04 recently and tapping Alt doesn't do anything. The Alt (tap) shortcut is even gone from the cheat sheet that appears when I hold Super.
Is this normal?
Try System Settings - Keyboard - Shortcuts - Launchers. Do you see 'Key to show the HUD'? It should be the left Alt key.
Required, but never shown