/usr/share/mate-background-properties/ubuntu-mate-bionic.xml is in ubuntu-mate-wallpapers-bionic 18.04.11.
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 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "mate-wp-list.dtd">
<wallpapers>
<wallpaper deleted="false">
<name>Silky</name>
<filename>/usr/share/backgrounds/ubuntu-mate-bionic/Silky.jpg</filename>
<options>zoom</options>
<artist>Milos Pavlovic</artist>
</wallpaper>
</wallpapers>
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