Kubeadm: Will not work on ubuntu 18.04

Is this a request for help? Yes. I tried to troubleshoot and it didn't work

If yes, you should use our troubleshooting guide and community support channels, see http://kubernetes.io/docs/troubleshooting/.

If no, delete this section and continue on.

What keywords did you search in kubeadm issues before filing this one? uninstall, purge, remove

If you have found any duplicates, you should instead reply there and close this page.

If you have not found any duplicates, delete this section and continue on.

Is this a BUG REPORT or FEATURE REQUEST? bug report

Choose one: BUG REPORT or FEATURE REQUEST

Versions

kubeadm version (use kubeadm version): will not load

*Environment

• Kubernetes version (use kubectl version): Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.1", GitCommit:"eec55b9ba98609a46fee712359c7b5b365bdd920", GitTreeState:"clean", BuildDate:"2018-12-13T10:39:04Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}

• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Others:

What happened?

sudo snap install kubeadm
error: This revision of snap "kubeadm" was published using classic confinement
and thus may perform arbitrary system changes outside of the security
sandbox that snaps are usually confined to, which may put your system at
risk.

   If you understand and want to proceed repeat the command including
   --classic.

jbrandes@k8s-master:~$ sudo snap install kubeadm--classic
error: snap "kubeadm--classic" not found

What you expected to happen? for it to load and remove kubernetes

How to reproduce it (as minimally and precisely as possible)?

Anything else we need to know?