/usr/share/glib-2.0/schemas/10_budgie-lightdm-theme.gschema.override is in budgie-lightdm-theme 0.9.6.
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 | [x.dm.slick-greeter]
font-name='Ubuntu 11'
background='/usr/share/backgrounds/Xplo_by_Hugo_Cliff.png'
draw-grid=false
theme-name='Pocillo-dark'
|