Recently I was asked to deploy a scientific software packaged as a VirtualBox image (OVA format). I prepared the environment (Debian 7) - installed required packages, enabled DKMS, imported the image - however, when I tried to start the VM, I got the following message:
Error: failed to start machine. Error message: VT-x is not available (VERR_VMX_NO_VMX)
I did some reading and realized that the problem lies in the fact that my Debian environment is running as a Hyper-V VM (I have no control over that), which doesn't support hardware-enabled "stacked" virtualization. So, I decided to turn the VT-x mode off by using the following commands:
VBoxManage modifyvm <VM_NAME> –-hwvirtex off VBoxManage modifyvm <VM_NAME> –-vtxvpid off
Unfortunately, for both commands, I'm getting the following error messages:
VBoxManage: error: Unknown option: -–hwvirtex VBoxManage: error: Unknown option: -–vtxvpid
I have also tried to turn off
hwvirtexclusive, but to no avail. Your advice will be much appreciated.