modprobe: ERROR: could not insert 'vboxdrv': Required key not available

DKMS: install completed.
Setting up virtualbox (5.0.40-dfsg-0ubuntu1.16.04.2) ...
vboxweb.service is a disabled or a static unit, not starting it.
Job for virtualbox.service failed because the control process exited with error code. See "systemctl status virtualbox.service" and "journalctl -xe" for details.
invoke-rc.d: initscript virtualbox, action "restart" failed.

● virtualbox.service - LSB: VirtualBox Linux kernel module
   Loaded: loaded (/etc/init.d/virtualbox; bad; vendor preset: enabled)
   Active: failed (Result: exit-code) since di 2018-03-20 14:05:46 CET; 6min ago
     Docs: man:systemd-sysv-generator(8)

mrt 20 14:05:45 paul-GP60-2QF systemd[1]: Starting LSB: VirtualBox Linux kernel module...
mrt 20 14:05:46 paul-GP60-2QF virtualbox[15359]:  * Loading VirtualBox kernel modules...
mrt 20 14:05:46 paul-GP60-2QF virtualbox[15359]:  * modprobe vboxdrv failed. Please use 'dmesg' to find out why
mrt 20 14:05:46 paul-GP60-2QF virtualbox[15359]:    ...fail!
mrt 20 14:05:46 paul-GP60-2QF systemd[1]: virtualbox.service: Control process exited, code=exited status=1
mrt 20 14:05:46 paul-GP60-2QF systemd[1]: Failed to start LSB: VirtualBox Linux kernel module.
mrt 20 14:05:46 paul-GP60-2QF systemd[1]: virtualbox.service: Unit entered failed state.
mrt 20 14:05:46 paul-GP60-2QF systemd[1]: virtualbox.service: Failed with result 'exit-code'.