This file is indexed.

postinst is in upstart-sysv 1.13.2-0ubuntu21.

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

# update grub on first install, so that the alternative init system boot
# entries get updated
if [ "$1" = configure ] && [ -z "$2" ] && [ -e /boot/grub/grub.cfg ] && which update-grub >/dev/null 2>&1; then
    update-grub || true
fi