sudo modprobe vboxdrv
modprobe: FATAL: Module vboxdrv not found.
(trusty)user@localhost:~$ sudo /etc/init.d/vboxdrv setup
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 3.10.18 cannot be found.
Please install the linux-headers-3.10.18 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)
(trusty)user@localhost:~$ cat /var/log/vbox-install.log
Uninstalling modules from DKMS
  removing old DKMS module vboxhost version  4.3.26

------------------------------
Deleting module version: 4.3.26
completely from the DKMS tree.
------------------------------
Done.
Attempting to install using DKMS

Creating symlink /var/lib/dkms/vboxhost/4.3.26/source ->
                 /usr/src/vboxhost-4.3.26

DKMS: add completed.
Failed to install using DKMS, attempting to install without
Makefile:183: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again.  Stop.