diff -r -puN installer/src/GLIArchitectureTemplate.py installer_mod/src/GLIArchitectureTemplate.py
--- installer/src/GLIArchitectureTemplate.py	2006-09-12 14:44:00.000000000 +0200
+++ installer_mod/src/GLIArchitectureTemplate.py	2006-09-12 14:42:53.000000000 +0200
@@ -407,6 +407,8 @@ class ArchitectureTemplate:
 					if partition_type:
 						if partition_type == "fat32" or partition_type == "fat16": partition_type = "vfat"
 						partition_type = "-t " + partition_type + " "
+						if partition_type == "-t unknown ": partition_type = ""
+
 					parts_to_mount[mountpoint] = (mountopts, partition_type, tmp_partitions[partition]['devnode'])
 					
 				if partition_type == "linux-swap":