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You may also use Ctrl+Alt+D for this purpose. Pressing Super+D again will open all the running applications windows as it was previously. Pressing Super+D minimizes all running application windows and shows the desktop. Some systems also use Ctrl+Alt+L keys for locking the screen. Instead of going to the top right corner and then choosing the lock screen option, you can simply use the Super+L key combination. Locking screen when you are not at your desk is one of the most basic security tips. I even mention it in various tutorials on It’s FOSS when it involves opening a terminal. This is my favorite keyboard shortcut in Ubuntu. You want to open a new terminal in Ubuntu? Ctrl+Alt+T is the shortcut to open terminal in Ubuntu.
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