/etc/xdg/lubuntu/lightdm/lightdm-gtk-greeter.conf is in lubuntu-default-settings 0.27.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# background = Background file to use, either an image path or a color (e.g. #772953)
# theme-name = GTK+ theme to use
# font-name = Font to use
# xft-antialias = Whether to antialias Xft fonts (true or false)
# xft-dpi = Resolution for Xft in dots per inch (e.g. 96)
# xft-hintstyle = What degree of hinting to use (hintnone, hintslight, hintmedium, or hintfull)
# xft-rgba = Type of subpixel antialiasing (none, rgb, bgr, vrgb or vbgr)
#
[greeter]
background=/usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png
#show-language-selector=false
theme-name=Lubuntu-default
#font-name=
xft-antialias=true
#xft-dpi=
xft-hintstyle=hintfull
xft-rgba=rgb
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