I am trying to deactivate Auto-login on the system settings/user accounts, but it even after I reboot the computer it will still log in automatically.
You dont' need your lightdm.conf file. I would rename the file as to make the system believe it isn't there. I only hae pantheon-greeter.conf and users.conf in my /etc/lightdm/ folder, and I don't have auto logins.
Make your /etc/lightdm/pantheon-greeter.conf look like this, too:
I really don't think you need a lightdm.conf for elementary. Try renaming the file.
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I had this problem after deleting a user that was set to login automatically. Deleting lightdm.conf resolved the issue. – Seth Jun 2 '19 at 19:49
cat /etc/lightdm/lightdm.conf? – Michael Mims Sep 16 '15 at 17:43