This file is indexed.

postrm is in bootcd-mkinitramfs 3.27.

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

# Regenerate initramfs on upgrade
if [ "$1" = "remove" ]; then
	if [ -x /usr/sbin/update-initramfs -a -e /etc/initramfs-tools/initramfs.conf ]; then
		update-initramfs -u -k all
	fi
fi