Comment 76 for bug 1569237

But it is totally unusable when you can't log in...

```
$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'ubuntu/xenial64' could not be found. Attempting to find and install...
    default: Box Provider: virtualbox
    default: Box Version: >= 0
==> default: Loading metadata for box 'ubuntu/xenial64'
    default: URL: https://atlas.hashicorp.com/ubuntu/xenial64
==> default: Adding box 'ubuntu/xenial64' (v20170919.0.0) for provider: virtualbox
    default: Downloading: https://vagrantcloud.com/ubuntu/boxes/xenial64/versions/20170919.0.0/providers/virtualbox.box
==> default: Box download is resuming from prior download progress
==> default: Successfully added box 'ubuntu/xenial64' (v20170919.0.0) for 'virtualbox'!
==> default: Importing base box 'ubuntu/xenial64'...
==> default: Matching MAC address for NAT networking...
==> default: Checking if box 'ubuntu/xenial64' is up to date...
==> default: Setting the name of the VM: upgraded_default_1505909538747_12474
==> default: Fixed port collision for 22 => 2222. Now on port 2200.
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
    default: Adapter 2: hostonly
==> default: Forwarding ports...
    default: 80 (guest) => 8180 (host) (adapter 1)
    default: 22 (guest) => 2200 (host) (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2200
    default: SSH username: ubuntu
    default: SSH auth method: password
Text will be echoed in the clear. Please install the HighLine or Termios libraries to suppress echoed text.
ubuntu@127.0.0.1's password:vagrant
ubuntu@127.0.0.1's password:ubuntu
    default: Warning: Authentication failure. Retrying...
Text will be echoed in the clear. Please install the HighLine or Termios libraries to suppress echoed text.
ubuntu@127.0.0.1's password:^C==> default: Waiting for cleanup before exiting...
Vagrant exited after cleanup due to external interrupt.

$ vagrant ssh
==> default: The machine you're attempting to SSH into is configured to use
==> default: password-based authentication. Vagrant can't script entering the
==> default: password for you. If you're prompted for a password, please enter
==> default: the same password you have configured in the Vagrantfile.
ubuntu@127.0.0.1's password:
ubuntu@127.0.0.1's password:
ubuntu@127.0.0.1's password:
Permission denied (publickey,password).
```