[kubuntu] No VirtualBox modules for kernel 3.8.1

I just installed the generic kernel 3.8.1 via the .deb files, however, upon installing, they gave me an error from dkms saying the VirtualBox kernel modules could not be installed. When I rebooted into the 3.8.1 kernel, I cannot run VirtualBox (the application gives me the error "Kernel driver not installed (rc=-1908)").

Where can I find the VirtualBox kernel drivers for 3.8.1?