This file is indexed.

/usr/share/gnome-background-properties/ug-xenial-wallpapers.xml is in ubuntu-gnome-wallpapers-xenial 16.04.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
  <wallpaper deleted="false">
    <name>Ubuntu GNOME 16.04 Community Wallpapers</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/xenial.xml</filename>
    <options>zoom</options>
  </wallpaper>
  <wallpaper>
    <name>Weathercock</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/weathercock.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
  <wallpaper>
    <name>Sky</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/sky-desktop.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
  <wallpaper>
    <name>Abstract</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/abstract-lock-screen.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
  <wallpaper>
    <name>Climbing Up</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/climbing-up.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
  <wallpaper>
    <name>Fruit</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/pexels-fruit.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
  <wallpaper>
    <name>Weathercock (Black and White)</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/weathercock-black-white.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
  <wallpaper>
    <name>Flower</name>
    <filename>/usr/share/backgrounds/ubuntu-gnome/pexels-flower.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>
</wallpapers>