/usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf is in lightdm-gtk-greeter 2.0.5-0ubuntu1.
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 | # Ubuntu specific defaults
#
[greeter]
background=/usr/share/backgrounds/warty-final-ubuntu.png
theme-name=Ambiance
icon-theme-name=LoginIcons
font-name=Ubuntu 11
xft-antialias=true
xft-dpi=96
xft-hintstyle=slight
xft-rgba=rgb
indicators=~host;~spacer;~session;~language;~a11y;~clock;~power;
clock-format=%d %b, %H:%M
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