This file is indexed.

postrm is in linux-image-extra-4.4.0-89-generic 4.4.0-89.112.

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

case "$0::$1" in
*.postinst::configure|*.postrm::remove)
	depmod -a -F /boot/System.map-4.4.0-89-generic 4.4.0-89-generic || true
	for dir in "/etc/kernel/postinst.d" "/etc/kernel/postinst.d/4.4.0-89-generic"
	do
		if [ -d "$dir" ]; then
			run-parts --verbose --exit-on-error --arg="4.4.0-89-generic" --arg="/boot/vmlinuz-4.4.0-89-generic" "$dir"
		fi
	done
	;;
esac