Lars - It is because your platform is UEFI in secure boot mode. You can disable secure boot using 'sudo mokutil --disable-validation; sudo reboot', or create and enroll your own DKMS key (linux 4.4.0-22.38 or higher). See the rough example at https://docs.google.com/document/d/1Z1_jR3MmxuvqolQH4PORkJCgENkb2Tlw4FVA-sHqdMw
Lars - It is because your platform is UEFI in secure boot mode. You can disable secure boot using 'sudo mokutil --disable- validation; sudo reboot', or create and enroll your own DKMS key (linux 4.4.0-22.38 or higher). See the rough example at https:/ /docs.google. com/document/ d/1Z1_jR3Mmxuvq olQH4PORkJCgENk b2Tlw4FVA- sHqdMw