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).
Simply press and hold ,bkd>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
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.
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
).12.04 and later
The keyboard shortcut to minimize all windows is Ctrl+Super+D in Ubuntu 12.04 and later.
Simply press and hold ,bkd>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
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.
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
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.
you can setting. go to Keyboard Shortcuts.
e.g. Change Ctrl+Super+D to Super+D