--- a/com.cfg	Wed Sep 04 17:00:12 2013 +0200
+++ b/com.cfg	Wed Sep 04 17:00:27 2013 +0200
@@ -142,7 +142,7 @@
 d-i	preseed/interactive	boolean	false
 d-i	preseed/late_command	string	\
     in-target perl -i.bak -ne 'print unless /^deb cdrom:/' /etc/apt/sources.list; \
-    in-target apt-get update && in-target apt-get upgrade
+    in-target apt-get -y update && in-target apt-get -y upgrade
 d-i	preseed/load_error	error	
 d-i	preseed/retrieve_error	error	
 d-i	preseed/run	string