Today I just need to change my lighdm login screen backgroung to something different. To do so there are so many different tools are available to ease this task for eg “Simple LightDM Manager”, but I want to do it manually.
Open /etc/lightdm/unity-greeter.conf and look for BACKGROUND tag. To customize your login screen replace the BACKGROUND value to your own pic in either jpg or png format
sudo vi /etc/lightdm/unity-greeter.conf
Just edit the line that says BACKGROUND with the absolute path to the background image of your desire. Then log off and login again.
Enjoy! Stay tuned for more such articles.



