title: Minikube not starting on Ubuntu, throwing errors
body: <p>I'm running Ubuntu 17.04 (zesty) on a Dell XPS 13 (3854 MB of RAM and Intel Core i5-5200U CPU @ 2.20GHz) and trying to start up Minikube, but I'm getting a couple errors when I try to start it up.</p>
  
  <pre><code>➜  minikube version
  minikube version: v0.22.3
  
  ➜  kubectl version
  Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.5", GitCommit:"17d7182a7ccbb167074be7a87f0a68bd00d58d97", GitTreeState:"clean", BuildDate:"2017-08-31T09:14:02Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
  The connection to the server localhost:8080 was refused - did you specify the right host or port?
  </code></pre>
  
  <p>I have VM VirtualBox Version 5.2.0 r118431 (Qt5.7.1). I've checked the BIOS settings and have virtualization enabled.</p>
  
  <pre><code>➜  minikube start
  Starting local Kubernetes v1.7.5 cluster...
  Starting VM...
  E1025 09:49:40.206594   22972 start.go:146] Error starting host: Error starting stopped host: Unable to start the VM: /usr/bin/VBoxManage startvm minikube --type headless failed:
  VBoxManage: error: The virtual machine 'minikube' has terminated unexpectedly during startup with exit code 1 (0x1)
  VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine
  .
  
   Retrying.
  E1025 09:49:40.207051   22972 start.go:152] Error starting host:  Error starting stopped host: Unable to start the VM: /usr/bin/VBoxManage startvm minikube --type headless failed:
  VBoxManage: error: The virtual machine 'minikube' has terminated unexpectedly during startup with exit code 1 (0x1)
  VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine
  </code></pre>
  
  <p>I've tried some suggests that I've found online, like running <code>~/rm -rf .minikube/</code> and trying to start up minikube again. I've tried running <code>minikube stop</code> followed by a <code>minikube delete</code> and then trying to start minikube again. I've tried specifying the virtualbox driver when starting as well <code>minikube start --vm-driver=virtualbox</code>. These aren't working, I still get the same error.</p>