security - Lock screen Ubuntu 16.04 - Ask Ubuntu


i unable lock screen either using ctrl-alt-l or waiting 5 minutes (inactive time option). after pressing combination of keys (or waiting 5 minutes), screen turns off not ask password return desktop. can me please? thank you!

here settings:

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enter image description here

i solved problem. there option in unity tweak tool preventing screen lock. desktop lock checkbox must disabled. https://askubuntu.com/a/91719/219893

unity tweak tool desktop lock


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