Update netboot.sh

netboot.sh

@@ -16,7 +16,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -ex
+set -e
 
 while [ $# -gt 0 ]; do
   case $1 in
@@ -370,3 +370,6 @@ initrd $DEBI_TARGET_PATH/initrd.gz
 EOF
 
 fi
+
+cat preseed.cfg
+tail -n 7 "$DEBI_GRUB_CONFIG"