The first thing is to locate your background image and place it in the root directory. (Obviously, if it's in your home folder, this is inaccessible once you log out.) I suggest you place it where the other root background images are located.
/usr/share/lubuntu/wallpapers
Open this location with root access (Tools -> Open Current Folder as Root)
Paste in your new login background image or drag-and-drop.
In the same root-access window, open the LightDM configurations:
/etc/lightdm
Open the file named lightdm-gtk-greeter.conf
Finally, change the background option. Because the image should be in the same directory, simply change the file name.
Logout and enjoy the new eye-candy.
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