diff --git a/xCAT-server/share/xcat/install/ubuntu/compute.tmpl b/xCAT-server/share/xcat/install/ubuntu/compute.tmpl
index b2946df6d..ac94520da 100644
--- a/xCAT-server/share/xcat/install/ubuntu/compute.tmpl
+++ b/xCAT-server/share/xcat/install/ubuntu/compute.tmpl
@@ -33,7 +33,8 @@ d-i mirror/http/proxy string
 # This creates a small /boot partition, suitable
 # swap, and uses the rest of the space for the root partition:
 
-d-i partman-auto/method strng regular
+d-i partman-auto/method string regular
+d-i partman-auto/disk string /dev/sda
 d-i partman-lvm/device_remove_lvm boolean true
 d-i partman-md/device_remove_md boolean true