I used "Ubuntu Tweak" to deactivate the login/users screen in order to save time (with not giving the password). It worked. It was ok. But now i need to create another user. I did create another user and I went back to "Ubuntu Tweak"; i reset the option about showing the login/users screen, but it does not work. After starting up my machine, it goes directly to my account, showing me my desktop.
How can i restore the login/users screen? (i have tried uninstalling/purging Ubuntu Tweak and reinstalling it, but nothing changed)