I'm using Zorin OS 15.3 Lite
I'm really bored seeing the same picture in log in screen. Can someone help me to change that?
sudo apt install lightdm-gtk-greeter-settings
In the app menu, begin typing
Lightdm and the Greeter Settings should be offered. Launch the application.
Here you can adjust many aspects of the Login screen, including the background.
Be sure to hit the
Save button before exiting.