/etc/lightdm/lightdm-gtk-greeter.conf is in lightdm-gtk-greeter 2.0.1-2ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | # LightDM GTK+ Configuration
# Available configuration options listed below.
#
# Appearance:
# theme-name = GTK+ theme to use
# icon-theme-name = Icon theme to use
# background = Background file to use, either an image path or a color (e.g. #772953)
# user-background = false|true ("true" by default) Display user background (if available)
# transition-duration = Length of time (in milliseconds) to transition between background images ("500" by default)
# transition-type = ease-in-out|linear|none ("ease-in-out" by default)
#
# Fonts:
# font-name = Font to use
# xft-antialias = false|true Whether to antialias Xft fonts
# xft-dpi = Resolution for Xft in dots per inch (e.g. 96)
# xft-hintstyle = none|slight|medium|hintfull What degree of hinting to use
# xft-rgba = none|rgb|bgr|vrgb|vbgr Type of subpixel antialiasing
#
# Login window:
# active-monitor = Monitor to display greeter window (name or number). Use #cursor value to display greeter at monitor with cursor. Can be a semicolon separated list
# position = x y ("50% 50%" by default) Login window position
# default-user-image = Image used as default user icon, path or #icon-name
# hide-user-image = false|true ("false" by default)
#
# Panel:
# panel-position = top|bottom ("top" by default)
# clock-format = strftime-format string, e.g. %H:%M
# indicators = semi-colon ";" separated list of allowed indicator modules. Built-in indicators include "~a11y", "~language", "~session", "~power", "~clock", "~host", "~spacer". Unity indicators can be represented by short name (e.g. "sound", "power"), service file name, or absolute path
#
# Accessibility:
# a11y-states = states of accessibility features: "name" - save state on exit, "-name" - disabled at start (default value for unlisted), "+name" - enabled at start. Allowed names: contrast, font, keyboard, reader.
# keyboard = command to launch on-screen keyboard (e.g. "onboard")
# keyboard-position = x y[;width height] ("50%,center -0;50% 25%" by default) Works only for "onboard"
# reader = command to launch screen reader (e.g. "orca")
#
# Security:
# allow-debugging = false|true ("false" by default)
# screensaver-timeout = Timeout (in seconds) until the screen blanks when the greeter is called as lockscreen
#
# Template for per-monitor configuration:
# [monitor: name]
# background = overrides default value
# user-background = overrides default value
# laptop = false|true ("false" by default) Marks monitor as laptop display
# transition-duration = overrides default value
#
[greeter]
#background=
#user-background=
#theme-name=
#icon-theme-name=
#font-name=
#xft-antialias=
#xft-dpi=
#xft-hintstyle=
#xft-rgba=
#indicators=
#clock-format=
#keyboard=
#reader=
#position=
#screensaver-timeout=
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