Halt at the end instead of rebooting

preseed.cfg

@@ -62,9 +62,10 @@ d-i pkgsel/include string build-essential ruby-dev rubygems puppet ssh
 # Go grub, go!
 d-i grub-installer/only_debian boolean true
 
-# Reboot, already
+# Shut down, already
 d-i finish-install/reboot_in_progress note
-
+#d-i debian-installer/exit/halt boolean true
+d-i debian-installer/exit/poweroff boolean true
 
 ##### cli.seed #####