Thanks! This works great. This let's me use vagrant now from within my VM.   To make this a permanent setting (survive reboot), go to your main page of the unraid console, click on your Flash drive, and edit the syslinux configuration.   From here you can add the correct kernel boot parameter: kvm_intel.nested=1   Mine looks like:       Hopefully new versions of UnRAID will include this setting out of the box.