title: Unable to add kubernetes-bionic main (Ubuntu 18.04) to apt repository
body: <p>I'm trying to install Kubernetes on my Ubuntu server/desktop version 18.04.1. 
  But, when I want to add kubernetes to the apt repository using the following command:</p>
  
  <pre><code>sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-bionic main"
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>Hit:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
  Hit:2 http://archive.ubuntu.com/ubuntu bionic InRelease                                                                                               
  Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                          
  Hit:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                                       
  Hit:5 http://dl.google.com/linux/chrome/deb stable Release                                                                                            
  Hit:6 http://archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                                     
  Hit:7 https://download.docker.com/linux/ubuntu bionic InRelease                                                                                       
  Ign:8 https://packages.cloud.google.com/apt kubernetes-bionic InRelease                              
  Err:10 https://packages.cloud.google.com/apt kubernetes-bionic Release
    404  Not Found [IP: 216.58.211.110 443]
  Reading package lists... Done
  E: The repository 'http://apt.kubernetes.io kubernetes-bionic Release' does not have a Release file.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  </code></pre>
  
  <p>If I then try to install <code>kubeadm</code>, it does not work because I don't have the repository added to apt</p>
  
  <p>I hope someone can shed some light on my issue..</p>
  
  <p>All of this is running inside a VM on Hyper-V</p>
  
  <p>PS: I'm not a die hard Linux expert but coming from Windows!</p>