Comment 5 for bug 1574300

But if something works in 15.10 and breaks in 16.04 LTS, then it can be considered a bug :)
it does not seem a bug, but a policy; see

https://answers.launchpad.net/ubuntu/+question/292158

https://www.virtualbox.org/ticket/11577#comment:2

to disable validation of modules (and maybe of kernel too?) see
http://askubuntu.com/a/762248/534960

** Bug watch added: Virtualbox Trac #11577
   http://www.virtualbox.org/ticket/11577

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https://bugs.launchpad.net/bugs/1574300

Title:
  Could not load 'vboxdrv' after upgrade to Ubuntu 16.04

Status in virtualbox package in Ubuntu:
  Confirmed

Bug description:
  http://askubuntu.com/q/760671

  I upgrade from Ubuntu 15.10 to 16.04 and since then VirtualBox 5.0.18 isn't starting my VMs anymore. It complains that 'vboxdrv' isn't loaded. So I try to load it and get the following error:

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

  There are some solutions which require signing the modules locally. But, why did virtualbox break on upgrade?
  I installed the new kernel sources, dpkg-reconfigured virtualbox-dkms package, but still get the same error.

  Please let me know if you need additional logs/info

  Thanks.

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