--- a/choose_partition/md/do_option	
+++ a/choose_partition/md/do_option	
@@ -226,7 +226,6 @@ md_create_array () {
 
 	local layout=
 	if [ "$level" -eq 10 ]; then
-		db_set partman-md/raid10layout n2
 		while :; do
 			db_input low partman-md/raid10layout
 			db_go || return
--- a/debian/partman-md.templates	
+++ a/debian/partman-md.templates	
@@ -109,6 +109,7 @@ _Description: Not enough RAID partitions available
 
 Template: partman-md/raid10layout
 Type: string
+Default: n2
 # :sl3:
 _Description: Layout of the RAID10 array:
  The layout must be n, o, or f (arrangement of the copies) followed