Though I have successfully installed kubernetes via the ubuntu doc 😃 , still want to point out this doc missing the step to install kubectl.

Thus, if user just follow the guide in the doc without having much knowledge about kubernetes, he/she would get error "It looks as if you don't have a compiled kubectl binary" during the validate-cluster step of kube-up.sh.

Manually install kubectl on at least master node should be necessary (suggest to let user also install on minion node for convenience), any way, the installation step is pretty simple.