If your motherboard or processor does not support either Intel VT or AMD-V, this tutorial will not help you
The fix seems to work with AMD motherboards, can't be sure of Intel but would expect that the same "enable virtualisation" switch in bios should do the trick.
Full error message:
Failed to open a session for the virtual machine Debian_Purkkaviritys.
Failed to load VMMR0.r0 (VERR_SVM_DISABLED).
Result Code: E_FAIL (0x80004005)
Component: Console
Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}