PS C:\Users\brand_000\Homestead> vagrant ssh
Welcome to Ubuntu 14.10 (GNU/Linux 3.16.0-23-generic x86_64)

 * Documentation:  https://help.ubuntu.com/
Last login: Mon Oct 27 02:22:37 2014 from 10.0.2.2
vagrant@homestead:~$ sudo rm /usr/lib/VBoxGuestAdditions
vagrant@homestead:~$ sudo ln -s /opt/VBoxGuestAdditions-4.3.18/lib/VBoxGuestAdditions /usr/lib/VBoxGuestAdditions
vagrant@homestead:~$ sudo apt-get install --yes dkms linux-headers-3.16.0-23-generic
Reading package lists... Done
Building dependency tree
Reading state information... Done
linux-headers-3.16.0-23-generic is already the newest version.
dkms is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
vagrant@homestead:~$ sudo /etc/init.d/vboxadd setup
Removing existing VirtualBox DKMS kernel modules ...done.
Removing existing VirtualBox non-DKMS kernel modules ...done.
Building the VirtualBox Guest Additions kernel modules
The headers for the current running kernel were not found. If the following
module compilation fails then this could be the reason.

Building the main Guest Additions module ...done.
Building the shared folder support module ...fail!
(Look at /var/log/vboxadd-install.log to find out what went wrong)
Doing non-kernel setup of the Guest Additions ...done.
vagrant@homestead:~$