Clark, thanks for the report about Openstack + the testing you did. As my IRC proxy died (quite literally) today it's easier for me to continue this on email. I have CC'd this email to the libguestfs mailing list, which does not require subscription, however the first time you send an email it will require me to manually approve the message. I would suggest to debug this further, the best thing is to run the following command on the Ubuntu host, capturing all the output. libguestfs-test-tool Nova runs libguestfs as root (which is a bad thing, we prefer never to run anything as root). So you could try it both as root and as a non-root ordinary user. Another test would be actual file injection: guestfish -i -a somedisk.img ><fs> edit /some/file Use -v -x to get a lot of extra debugging from guestfish. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v