Is there a keyboard shortcut to minimize all windows, like Super+M on Windows?
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how about minimizing the current active window? – MycrofD May 14 '19 at 13:27
8 Answers
For 10.10, 13.10 and 17.10
Super+D is the default keyboard shortcut for minimizing all windows in Ubuntu 10.10.
You can change it to Super+M like it is in Windows using the Keyboard Shortcuts utility:
System ➜ Preferences ➜ Keyboard Shortcuts

Note: The keyboard shortcut Super+M is used by both the Messaging Menu (see this question for a solution) and the Negative Compiz plugin (You can disable or change its keyboard shortcuts by using
compizconfig-settings-manager).
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1In 10.04 and 11.04 ctrl-alt-d does this, weird that it got changed for 10.10 and then back. – Jorge Castro Feb 23 '11 at 19:19
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1no luck with CTRL+ALT+D on my Ubuntu 10.10 / 64 bits desktop. CTRL+ALT+L work to lock the screen though... – Bob Yoplait Feb 23 '11 at 19:45
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Got you, the message must have been edited because at first, it was CTRL+ALT. Thanks. – Bob Yoplait Feb 23 '11 at 19:54
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@AlvinRow The last image after "compizconfig-settings-manager" is broken, it returns "The image you are requesting does not exist or is no longer available" – Ferrybig Feb 19 '16 at 12:04
12.04 and later
The keyboard shortcut to minimize all windows is Ctrl+Super+D in Ubuntu 12.04 and later.
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Simply press and hold Super key (which is generally the key with Windows logo on it) you will get list of all the shortcuts. In my Ubuntu 12.04 minimizing all windows in Ctrl+Super+d.

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Also, in 16.04 Ctrl + Super+D works to show desktop / minimise all windows. When at desktop, same can be used to restore windows before show desktop.
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In my distro (Ubuntu 15.10), the shortcut is Ctrl+Alt+D.
It was the same with Ubuntu 14.04 LTS (From which I upgraded later).
Summary of answers
10.04, 11.04: Ctrl+Alt+D
10.10, 13.10: Super+D
12.04, 14.04, 16.04, 18.04: Ctrl+Super+D
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In Ubuntu 20.04 you can press Ctrl + Alt + D to quickly minimize all windows and (if you haven't opened any windows since that) you can also un-minimize them by pressing Ctrl + Alt + D again.
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Note: in Ubuntu Unity the "Show Desktop" button in the dock has to be enabled for Super+D to work as that. In some other linux distros it's also Super+D instead of Ctrl+Alt+D and Ctrl+Alt+D might not work in those distros. – Lampe2020 Nov 17 '22 at 12:36
