This file is indexed.

/usr/lib/tasksel/tests/preferred-desktop is in tasksel-data 2.88ubuntu15.

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
# Choose which desktop environment should be installed to enhance the desktop
# task. tasksel/desktop can be preseeded to select which to install.
set -e

# Avoid starting debconf if not being used to test which enhancing task to
# install.
if [ ! "$TESTING_ENHANCER" ]; then
	exit 1
fi

. /usr/share/debconf/confmodule

if db_get "tasksel/desktop" && echo "$RET" | grep -q "$2"; then
	exit 0
else
	exit 1
fi