postinst is in gnome-activity-journal 0.9.is.really.0.8.0-0ubuntu2.
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 11 12 13 14 15 16 17 18 19 20 | #! /bin/sh
set -e
# Automatically added by dh_pysupport
if which update-python-modules >/dev/null 2>&1; then
	update-python-modules  gnome-activity-journal.public gnome-activity-journal.private
fi
# End automatically added section
restart_daemon()
{
	# Tell any running Zeitgeist daemon to stop gracefully - they'll be
	# restarted through D-Bus activation the next time they are needed.
	kill -s HUP `pidof -x zeitgeist-daemon` >/dev/null 2>&1 || true
}
if [ "$1" = configure ]; then
	restart_daemon
fi
 |