I have the following error:
Kernel driver not installed (rc=-1908)
Please install the virtualbox-ose-dkms package
and execute 'modprobe vboxdrv' as root.
This forbids me to launch any virtual machine.
I checked and I already have the virtualbox-ose-dkms
package installed. As a matter of fact I reinstalled it too, but it did not solve the problem.