This file is indexed.

/usr/lib/ubiquity/target-config/20xconfig is in ubiquity-casper 1.394.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

if [ -f /etc/X11/xorg.conf ]; then
    cp -a /etc/X11/xorg.conf /target/etc/X11/xorg.conf
    # requires x11-common (>= 7.0.0-0ubuntu1)
    mkdir -p /target/var/lib/x11
    chroot /target sh -c 'md5sum /etc/X11/xorg.conf > /var/lib/x11/xorg.conf.md5sum'
fi

exit 0