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    That's a window-manager specific feature (and almost all of Ubuntu comes from Debian without noticeable improvement). Likely it exists in Debian, but was part of testing rather than stable. Commented Sep 3, 2016 at 10:40
  • @ThomasDickey Yes, you are right. There should be something corresponding. I am trying to understand how Debianists think. Commented Sep 3, 2016 at 10:41
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    Actually in this case the software involved doesn't come from Debian. Ubuntu's desktop environment and window manager, Unity, is Ubuntu-specific; that's what provides the help screen. I don't know of an equivalent in GNOME (which is what you're running on Debian), there might well be something in the documentation, or you could look at the keyboard and shortcut settings. Commented Sep 3, 2016 at 12:03
  • @StephenKitt Is there anything corresponding for the action Show desktop in Debian? Commented Sep 3, 2016 at 13:41
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    In the keyboard settings, in "Navigation", "Hide all normal windows" should do the trick; it doesn't have a default shortcut, you'll need to assign one yourself (click on it and press the keys you wish to use). Commented Sep 3, 2016 at 17:43