This file is indexed.

preinst is in libpam-modules 1.1.8-1ubuntu2.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

. /usr/share/debconf/confmodule

if dpkg --compare-versions "$2" lt-nl 1.1.3-2; then
	db_version 2.0

	if pidof xscreensaver xlockmore >/dev/null; then
		db_input critical libpam-modules/disable-screensaver || true
		db_go || true
	fi
fi