After failing to get things to work on a Ubuntu 14.04 host I build a fedora 21 environment to see if Ubuntu may have been the problem and didn't get quite as far so here's an official report per the FAQ directions: - Trying to get guests to build and have network access so package management actions can be done before uploading to openstack image service. - I ran ./run virt-builder fedora-18 -v -x (also tried fedora-21, same issue) - Using supermin 5.1.2, libguestfs 1.29.29 both built from source on fedora 21 host with all updates. "yum-builddep libguestfs" was run first to pull dependencies. Short version is that I get a bunch of Invalid module format errors then supermin waiting for /sys/block/sdb/dev to appear and it never does. Full output attached. Thanks, Lee