Question: vt-x is not available (verr_vmx_no_vmx) virtualbox 6?
Answer: VT-x is not available (VERR_VMX_NO_VMX). Now my searches have told me that this is most commonly due to either virtualization not being enabled in BIOS, or Hyper-V running and not allowing VirtualBox access to VMX. I have checked my machine's BIOS and confirmed that virtualization is enabled.