I have set from to minimize all windows settings to super + d button.
Some time later this Super + D button does not works.
When I check the setting i see that it is disabled.
What should I do not to disable itself after a time?
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In 14.04, Super+D does not seem to work (at least to reveal the Desktop).
I would rely on the same shortcut as the one defined in the Unity Compiz plugin: Ctrl+Super+D
To enable Super+D without the need of defining a shortcut, just activate the Desktop Launcher icon in System Settings → Appearance → Behavior: