This file is indexed.

/usr/share/initramfs-tools/scripts/casper-bottom/48xubuntu_maybe_ubiquity is in xubuntu-live-settings 18.04.6.

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

PREREQ=""
DESCRIPTION="Preparing for maybe-ubiquity mode..."

prereqs()
{
       echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
       prereqs
       exit 0
       ;;
esac

. /scripts/casper-functions

log_begin_msg "$DESCRIPTION"

#should cover both maybe-ubiquity and only-ubiquity and automatic-ubiquity modes
if grep "ubiquity" /proc/cmdline >/dev/null; then
    mkdir -p /root/home/$USERNAME/.config
    cp -R /root/etc/xdg/xdg-xubuntu/xfce4  /root/home/$USERNAME/.config
    chroot /root chown -R $USERNAME:$USERNAME /home/$USERNAME/.config
fi

log_end_msg