vagrant and virtualbox not compatible

[Jeremy]

On upgrading all of my local packages VirtualBox got upgraded to 5.1, however, vagrant is still on 1.8.0 which does not support VirtualBox 5.1. It is possible to hack vagrant to support the version see https://github.com/hashicorp/vagrant/issues/9090 (this is for 5.1 -> 5.2 compatibility but the fix still works).

Upgrading virtual box to 2.0.1 would also fix the issue, but this does not seem to be available for Xenial.

As it stands the upgrade breaks compatibility.

Ubuntu Version

Description: Ubuntu 16.04.4 LTS
Release: 16.04

Vagrant Package
vagrant:
  Installed: 1:1.8.0
  Candidate: 1:1.8.0
  Version table:
 *** 1:1.8.0 100
        100 /var/lib/dpkg/status
     1.8.1+dfsg-1ubuntu0.2 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages
     1.8.1+dfsg-1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu xenial/universe i386 Packages

VirtualBox Package

virtualbox:
  Installed: 5.1.34-dfsg-0ubuntu1.16.04.2
  Candidate: 5.1.34-dfsg-0ubuntu1.16.04.2
  Version table:
 *** 5.1.34-dfsg-0ubuntu1.16.04.2 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
        100 /var/lib/dpkg/status
     5.0.18-dfsg-2build1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages

Id expect to be able to do `vagrant up` after an upgrade as I could before, instead I get the error:

```
The provider 'virtualbox' that was requested to back the machine
'default' is reporting that it isn't usable on this system. The
reason is shown below:

Vagrant has detected that you have a version of VirtualBox installed
that is not supported by this version of Vagrant. Please install one of
the supported versions listed below to use Vagrant:

4.0, 4.1, 4.2, 4.3, 5.0

A Vagrant update may also be available that adds support for the version
you specified. Please check www.vagrantup.com/downloads.html to download
the latest version.
```

[Gianfranco Costamagna (costamagnagianfranco)]

Nope, vagrant in xenial updates is compatible with virtualbox 5.1
https://launchpad.net/ubuntu/+source/vagrant/1.8.1+dfsg-1ubuntu0.2

[Gianfranco Costamagna (costamagnagianfranco)]

please tell me your vagrant version

[Launchpad Janitor (janitor)]

[Expired for vagrant (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for virtualbox (Ubuntu) because there has been no activity for 60 days.]