Use these steps to install Kubernetes tools on the master and worker nodes.
$ curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
$ sudo vim /etc/apt/sources.list.d/kubernetes.list
> deb http://apt.kubernetes.io/ kubernetes-xenial main
$ sudo apt-get update
$ sudo apt-get install kubelet kubeadm kubectl