Ubuntu 16.04にアップグレードしたらVirtualBoxを使えなくなった

Ubuntu 15.10でVagrant経由でVirtualBoxを使用していましたが、Ubuntu 16.04にアップグレード後、VirtualBoxで仮想マシンを起動できなくなりました。


% vagrant up
The provider 'virtualbox' that was requested to back the machine
'default' is reporting that it isn't usable on this system. The
reason is shown below:

VirtualBox is complaining that the installation is incomplete. Please
run `VBoxManage --version` to see the error message which should contain
instructions on how to fix this error.
% VBoxManage --version
WARNING: The character device /dev/vboxdrv does not exist.
         Please install the virtualbox-dkms package and the appropriate
         headers, most likely linux-headers-generic.

         You will not be able to start VMs until this problem is fixed.
% sudo modprobe vboxdrv
modprobe: ERROR: could not insert 'vboxdrv': Required key not available

同様の問題が フォーラムにありました



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