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I had a similar issue on FC 27 (with the 4.14.8-300.fc27.x86_64 kernel). When FC updates (esp the kernel i guess), VBox does not load as the vboxdrv kernel module has to be rebuilt for the new kernel. So, from the shell:

$ VBox

WARNING: The vboxdrv kernel module is not loaded. Either there is no module available for the current kernel (4.14.8-300.fc27.x86_64) or it failed to load. Please try load the kernel module by executing as root

       dnf install akmod-VirtualBox kernel-devel-4.14.8-300.fc27.x86_64
       akmods --kernels 4.14.8-300.fc27.x86_64 && systemctl restart systemd-modules-load.service

     You will not be able to start VMs until this problem is fixed.

Unknown application - VBox

$

Follow the instructions above and all should be fine..