How to set Wallpaper in Log In screen

Hey there
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?

Install

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.

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