This file is indexed.

postrm is in gce-compute-image-packages 20180129+dfsg1-0ubuntu3.

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
# Automatically added by dh_systemd_enable/11.1.6ubuntu1
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask 'google-accounts-daemon.service' 'google-clock-skew-daemon.service' 'google-instance-setup.service' 'google-ip-forwarding-daemon.service' 'google-network-setup.service' 'google-shutdown-scripts.service' 'google-startup-scripts.service' >/dev/null || true
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge 'google-accounts-daemon.service' 'google-clock-skew-daemon.service' 'google-instance-setup.service' 'google-ip-forwarding-daemon.service' 'google-network-setup.service' 'google-shutdown-scripts.service' 'google-startup-scripts.service' >/dev/null || true
		deb-systemd-helper unmask 'google-accounts-daemon.service' 'google-clock-skew-daemon.service' 'google-instance-setup.service' 'google-ip-forwarding-daemon.service' 'google-network-setup.service' 'google-shutdown-scripts.service' 'google-startup-scripts.service' >/dev/null || true
	fi
fi
# End automatically added section