AccountsService file:
  Background=/usr/share/xfce4/backdrops/xubuntu-wallpaper.png

Lightdm uses this value as user's background at login screen. But 
AccountsService do not support color as "Background" value.
When you change your background to black color the old value is not updated. 
And you will see your old wallpaper at login screen.

Just remove this line or change your wallpaper to desired image.

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https://bugs.launchpad.net/bugs/1393846

Title:
  Screen Lock shows wrong wallpaper

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