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Archive for the ‘Virtualisation’ Category

If VirtualBox opens fine, but when you try to start a virtual machine (VM) you get the following error:

Failed to start the virtual machine Windows XP.
VirtualBox can’t operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

… it means another virtualisation package – kvm – is interfering with VirtualBox. kvm isn’t installed on Ubuntu by default, so you probably installed qemu, the popular open-source emulator.

A quick fix is to stop kvm via the terminal:

sudo /etc/init.d/kvm stop

To stop this happening completely, mark the following packages for complete removal in Synaptic if they’re installed: kvm, qemu, qemu-kvm & qemu-launcher. Or you can do it via the terminal, and ignore errors regarding packages that weren’t installed (so can’t be uninstalled):

sudo apt-get remove kvm qemu qemu-kvm qemu-launcher

You should now be able to start your VM, without having to close and restart VirtualBox.

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