You must sign these kernel modules before using VirtualBox code example

Example 1: If your system is using EFI Secure Boot you may need to sign the kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) before you can load them.

sudo -i
    cd /root/module-signing
    chmod 700 /root/module-signing/sign-vbox-modules
    ./sign-vbox-modules

Example 2: how to sign virtualbox kernel modules

sudo chmod 700 /root/bin/sign-vbox-modules
sudo -i sign-vbox-modules

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