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In older versions of Ubuntu when you pressed Ctrl+Alt+L it would lock and blank the screen (start the screensaver). In 14.04 it just locks the screen.

How can I get it to lock AND blank the screen?

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up vote 5 down vote accepted

Open System Settings and navigate to Keyboard -> Shortcuts. Open the "System" section, click on "Lock screen" and press Backspace. This will disable the system lock screen shortcut.

enter image description here

Now click the + button. A dialog will pop up asking for your input. Add a custom name and put:

gnome-screensaver-command -la  

in the "command" field.

enter image description here

Click "Apply". Now click "disabled" next to the shortcut you just created and press the key combination you want to use to lock and blank the screen.

enter image description here

You're done!

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