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
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