This file is indexed.

postinst is in memtest86+ 4.20-1.1ubuntu1.

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 [ "$1" = configure ]; then
    db_get shared/memtest86-run-lilo
    if [ "$RET" = true ] &&
	[ -x /sbin/lilo ] && [ -r /etc/lilo.conf ] &&
	grep "image.*=.*/boot/memtest86+.bin" /etc/lilo.conf >/dev/null
    then
	lilo
    fi

    if [ -e /boot/grub/grub.cfg ] && [ -x "`which update-grub2 2>/dev/null`" ] ; then
	update-grub2
    fi
fi