Oh I see an image was attached. The error is: KVM: entry failed, hardware error 0x0 I've no idea what that means, but you can use TCG instead: http://libguestfs.org/guestfs.3.html#force_tcg which will be slow but avoids using KVM. But the general problem seems to be that KVM is broken on your machine, which is going to cause you other problems eventually. Libguestfs was just the first thing to tell you. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/