It is about UEFI Secure Boot, which I don’t know exactly what it is, but if I remember right, it was a way to make my HD as secure as possible a couple of years ago when I bought this machine.*)
The error message I’m getting from VirtualBox is:
Kernel driver not installed (rc=-1908)
The VirtualBox Linux kernel driver is either not loaded or not set up correctly. Please try setting it up again by executing
‘/sbin/vboxconfig’
as root.
If your system has EFI Secure Boot enabled you may also need to sign the kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) before you can load them. Please see your Linux system’s documentation for more information.
where: suplibOsInit what: 3 VERR_VM_DRIVER_NOT_INSTALLED (-1908) - The support driver is not installed. On linux, open returned ENOENT.
I have tried to do the stuff the message says, and followed directions from this link:
https://superuser.com/questions/1438279/how-to-sign-a-kernel-module-ubuntu-18-04
… but the same error message persists.
But hey, I think this is not relevant to SAFE anymore, just problems of my specific system. If you think so too, maybe it is better I try to solve this with VirtualBox or Ubuntu resources. I don’t want to clutter this thread with irrelevant stuff.