case ${ACTION} in
post)
	cat <<_EOF
==========================================================================
To make lightdm work, a greeter package must be installed:

	lightdm-gtk-greeter: for a GTK+3 greeter
	lightdm-qt-greeter: for a QT greeter

To start lightdm: 'systemctl start lightdm.service'.
==========================================================================
_EOF
	;;
esac