Can't find lock computer option in ubuntu 18

Question

When I click ctrl+alt+del I wan to lock my computer (not log off). I can not find the lock option, only log out and it says

[user] will be logged out automatically in 60 seconds

How to enable lock screen in ubuntu 18 and disable auto log out?

Answer 1

Default keyboard shortcut in ubuntu 18 :

• Lock screen is Super + L
• Log out is Ctrl + Alt + Delete

If you want to change it, you can change it in Setting > Devices > Keyboard > System

Answer 2

As per this answer: Where is the power off button in Ubuntu 18.04 LTS ? try:

gsettings set org.gnome.desktop.lockdown disable-lock-screen false

Answer 3

Default keyboard shortcut in Xubuntu 18 seems to be Ctrl+Alt+L for those using this flavor