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Locking

Then he called his servant who ministered to him, and said, “Put now this woman out from me, and bolt the door after her.”

2 Samuel 13:17 (NHEB)

Screen Locking / Blanking

Screen Locking / Blanking


Your screen will automatically blank (go black) and lock after 10 minutes of no activity. That is, if you’ve made no changes to the settings.

Login sceen


Or, lock the screen when you choose by going to the Menu and clicking the lock icon near the top right.

Lock icon


Or, use a keyboard shortcut to lock the screen; the [Super] (Windows) key and the letter [L].

[Super] (Windows) key and the letter [L]

Prevent the screen from locking / blanking

No Locking / Blanking


Go to Menu > Settings > Power Manager

Menu > Settings > Power Manager


In the Display tab, make the following settings:
Display power management slide ON (right)
Blank after slide to 60 minutes (right)
Put to sleep after slide to 60 Minutes (right)
Switch off after slide to 60 minutes (right)
Display power management slide OFF (left)
[Close]

Power Manager


Go to Menu > Settings > Screensaver

Menu > Settings > Screensaver


In the Screensaver tab, set the following:
Enable screensaver move the slider to the ON position (right)
Activate screensaver when computer is idle move the slider to ON (right)
Regard the computer as idle after: 120 minutes (or whatever you prefer)
Inhibit screensaver for full screen applications move the slider to ON (right)
Activate screensaver when computer is idle move the slider to OFF (left)

Screensaver tab


Go to the Lock Screen tab
Enable Lock screen slide to OFF (left)
[Close]

Lock Screen tab

More Info see Xfce Screensaver on Xfce Documentation and MappingWindowsKey on the Ubuntu Community Help Wiki