Update README.md

Author: bweissman

samples/features/sql-big-data-cluster/deployment/kubeadm/ubuntu-single-node-vm/README.md

@@ -10,7 +10,7 @@ Using this sample bash script, you will deploy a single node Kubernetes cluster
 1. Update existing packages using commands below to ensure that the OS image is up to date
 
 ``` bash
-sudo apt update&&apt upgrade -y
+sudo apt update&&sudo apt upgrade -y
 sudo systemctl reboot
 ```