Super+Tab or Alt+Tab: Switch between running applications You can use Esc key to move out of the application menu screen. It will show the application menu where you can see the installed applications on your systems and can also search for them. However, a quicker way would be to use Super+A key combination.

You can open the application menu in Ubuntu 18.04 GNOME by clicking on the 9 dots on the left bottom of the screen. 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.

Function key to close all windows