Comment 41 for bug 1573095

While you can workaround the issue with

```
sudo sed -i 's/ console=ttyS0//g' /etc/default/grub.d/50-cloudimg-settings.cfg
sudo update-grub
```

You need ttyS0 in grub in order to interact with vm guest using

```
virsh console <vm-name>
```

I added a bug to virtualbox as it could be a compound issue or an issue on how they handle ttyS0 from os. https://www.virtualbox.org/ticket/18463