--- a/services/univention-ldb-modules/debian/libunivention-ldb-modules.postinst	
+++ a/services/univention-ldb-modules/debian/libunivention-ldb-modules.postinst	
@@ -40,7 +40,8 @@ case "$1" in
 			:
 		else
 			if test -x /etc/init.d/samba; then
-				invoke-rc.d --query samba ## check policy-rc.d
+				## check policy-rc.d
+				invoke-rc.d --query samba status
 				rc=$?
 				if [ "$rc" -eq 104 ] || [ "$rc" -eq 100 ]; then
 					/etc/init.d/samba restart