How to disable automatic login in LightDM?

gksudo gedit /etc/lightdm/lightdm.conf

It displays some text as follows:

[SeatDefaults]  
greeter-session=unity-greeter  
user-session=ubuntu  
autologin-user=username

Solution

This <username> would be your particular user name that is automatically logged in with or without password. Delete this username and type in the administrative username or leave it blank.
Shut down the system. It will go back to the login selection screen. Just power down the system and put it on again.

I had the same problem and it was solved by the command:

sudo gpasswd -d USER nopasswdlogin

where you should change USER by your user name.

System Setings

enter image description here

Disable Automatic Login

Related