Open the LightDM Configuration File

The syntax the command to edit the LightDM configuration file is:

sudo [text editor] /etc/lightdm/lightdm.conf

To use nano (the default text-based terminal editor) enter the command:

sudo nano /etc/lightdm/lightdm.conf

Otherwise, you may find it easier to read and edit the file by using gedit (or mousepad in recent releases), which is a graphical text editor:

sudo gedit /etc/lightdm/lightdm.conf

Set Autologin

Reboot your system to see if it works as intended.