This file is indexed.

postinst is in update-notifier-common 0.119ubuntu8.1.

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

# fixup /var/crash permissions (#449739)
if [ "$1" = configure ] && dpkg --compare-versions "$2" le-nl "0.89"; then
    if [ -d /var/crash ] && [ "$(stat -L -c '%a' /var/crash)" = "755" ]; then
        chmod 1777 /var/crash
    fi
fi

if [ "$1" = triggered ]; then
	for trigger in $2; do
		case $trigger in
			/usr/share/package-data-downloads)
				/usr/lib/update-notifier/package-data-downloader
				;;
		esac
	done
	exit 0
fi

# Run this when configuring as well, since we may not be triggered at all
# depending on package unpack order.
/usr/lib/update-notifier/package-data-downloader

# Remove update-motd cpu-checker script
dpkg-maintscript-helper rm_conffile /etc/update-motd.d/20-cpu-checker \
        0.110.1ubuntu1 -- "$@"