This file is indexed.

/usr/lib/ubiquity/target-config/60edubuntu-default-session is in edubuntu-live 14.04.2.

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

. /usr/share/debconf/confmodule

db_get ubiquity/edubuntu-addon_fallback_install
INSTALL="$RET"

if [ "$INSTALL" = "true" ]; then
    mkdir -p /target/etc/lightdm/lightdm.conf.d
    echo "[SeatDefaults]" > /target/etc/lightdm/lightdm.conf.d/90-edubuntu.conf
    echo "user-session=gnome-fallback" >> /target/etc/lightdm/lightdm.conf.d/90-edubuntu.conf
fi