/usr/share/glib-2.0/schemas/40_ubuntu-mate-live.gschema.override is in ubuntu-mate-live-settings 18.04.17.
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 | [org.mate.Marco.global-keybindings]
run-command-1='<Mod4>1'
[org.mate.Marco.keybinding-commands]
command-1='ubiquity gtk_ui'
[org.mate.background]
picture-filename='/usr/share/backgrounds/ubuntu-mate-common/Green-Wall.png'
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