Can't install VirtualBox 4.3 on 13.10

I've been trying to install VirtualBox but no luck. Whether I try 4.2 or 4.3 it gets to this...

Setting up virtualbox-4.3 [or 4.2] (4.3.2-90405~Ubuntu~raring) ...
addgroup: The group `vboxusers' already exists as a system group. Exiting.
Stopping VirtualBox kernel modules ...done.
Uninstalling old VirtualBox DKMS kernel modules ...done.
Trying to register the VirtualBox kernel modules using DKMSError! Your kernel headers for kernel 3.8.0-19-generic cannot be found.
Please install the linux-headers-3.8.0-19-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
...failed!
(Failed, trying without DKMS)
Recompiling VirtualBox kernel modules ...failed!
(Look at /var/log/vbox-install.log to find out what went wrong)

Tried installing linux-headers-3.8.0-19-generic but it's deprecated and no longer has an install candidate. Anyone able to point me in the direction of a fix?