If you have KVM kernel modules installed on your system then you would get following error message when you try to start VirtualBox. VirtualBox can’t operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot. VBox status code: -4011 (VERR_VMX_IN_VMX_ROOT_MODE). Result Code: 0×80004005 Component: Console Interface: IConsole {d5a1cbda-f5d7-4824-9afe-d640c94c7dcf} Solution [...]