postinst is in qemu-guest-agent 1:2.11+dfsg-1ubuntu7.
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.
| 1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
set -e
# Automatically added by dh_installinit/11.1.6ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -x "/etc/init.d/qemu-guest-agent" ]; then
		update-rc.d qemu-guest-agent defaults >/dev/null
		invoke-rc.d qemu-guest-agent start || exit 1
	fi
fi
# End automatically added section
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