Disable Remote Login in Ubuntu

Open a terminal.

Run the following commands:

sudo -i          # to have root privileges
gedit /etc/lightdm/lightdm.conf  # to edit /etc/lightdm/lightdm.conf

Add this line to the end of the file:

Save the file and close it.

Restart lightdm service
(from tty1 with sudo service lightdm restart)
 or restart computer.

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