/etc/lightdm/lightdm-gtk-greeter.conf.d/99_ubuntu-mate.conf is in ubuntu-mate-lightdm-theme 18.04.11.
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
# icon-theme-name = Icon 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 (none, slight, medium, or hintfull)
# xft-rgba = Type of subpixel antialiasing (none, rgb, bgr, vrgb or vbgr)
# indicators = semi-colon ";" separated list of allowed indicator modules. Built-in indicators include "~a11y", "~language", "~session", "~power". Unity indicators can be represented by short name (e.g. "sound", "power"), service file name, or absolute path
# keyboard = command to launch on-screen keyboard
# position = main window position: x y
# default-user-image = Image used as default user icon, path or #icon-name
# screensaver-timeout = Timeout (in seconds) until the screen blanks when the greeter is called as lockscreen
#
[greeter]
background=/usr/share/backgrounds/ubuntu-mate-artful/Ubuntu-MATE-Northern-Lights.jpg
theme-name=Ambiant-MATE
icon-theme-name=Ambiant-MATE
font-name=Ubuntu 11
xft-antialias=true
xft-dpi=96
xft-hintstyle=hintslight
xft-rgba=rgb
indicators = ~host;~spacer;~layout;~~ ;~language;~~ ;~a11y;~session;~power;~clock
keyboard=onboard
reader=orca
position = 20%,center 50%,center
default-user-image = #avatar-default
screensaver-timeout = 60
a11y-states=contrast;font;keyboard;reader
user-background = false
clock-format = %a %d %b, %H:%M
active-monitor=0
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