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Background:

I wanted to change the wallpaper background of my Ubuntu Unity 16.04 login screen. I installed lightdm-gtk-gtreeter-settings and only changed the wallpaper as shown below.

However, now my entire login screen looks different (similar to the one shown below).

Screenshot:

Lightdm greeter settings

Lightdm login screen

Question:

How do I restore the default Ubuntu Unity 16.04 login screen?

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