diff --git a/multi-node-aio/setup-cobbler.sh b/multi-node-aio/setup-cobbler.sh
index 7437ad56..e5d0784d 100755
--- a/multi-node-aio/setup-cobbler.sh
+++ b/multi-node-aio/setup-cobbler.sh
@@ -26,9 +26,7 @@ DEFAULT_IMAGE="${DEFAULT_IMAGE:-"$(lsb_release -sd | awk '{print $2}')"}"
 # The default kernel for Image, leave it empty will install the lastest kernel.
 DEFAULT_KERNEL="${DEFAULT_KERNEL:-}"
 
-if [ -z "$DEFAULT_KERNEL" ]; then
-  DEFAULT_KERNEL=linux-image-generic
-else
+if [ -n "$DEFAULT_KERNEL" ]; then
   DEFAULT_KERNEL="linux-image-$DEFAULT_KERNEL-generic"
 fi