This file is indexed.

preinst is in grub-legacy-ec2 0.7.7~bzr1212-0ubuntu1.

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

if [ "$1" = "install" -o "$1" = "upgrade" ]; then
   dpkg-divert --package grub-legacy-ec2 --rename --divert \
       /usr/sbin/grub-set-default.real --add /usr/sbin/grub-set-default
fi