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ubuntu@vpn:~$ VBoxManage startvm softether --type headless
WARNING: The vboxdrv kernel module is not loaded. Either there is no module
         available for the current kernel (4.15.0-142-generic) or it failed to
         load. Please recompile the kernel module and install it by

           sudo /sbin/vboxconfig

         You will not be able to start VMs until this problem is fixed.
Waiting for VM "softether" to power on...
VBoxManage: error: The virtual machine 'softether' has terminated unexpectedly during startup with exit code 1 (0x1)
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine