This file is indexed.

postinst is in initramfs-tools 0.103ubuntu4.

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 [ ! -e /etc/initramfs-tools/modules ]; then
	cp /usr/share/initramfs-tools/modules /etc/initramfs-tools/
fi

# Regenerate initramfs whenever we go to dpkg state `installed'
if [ "x$1" != xtriggered ]; then
	# this activates the trigger, if triggers are working
	update-initramfs -u
else
	# force it to actually happen
	DPKG_MAINTSCRIPT_PACKAGE='' update-initramfs -u
fi