[Libguestfs] Error mounting ubuntu cirros image?

# wget https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-di... # mkdir mnt # guestmount --rw -a cirros-0.3.0-x86_64-disk.img -i mnt libguestfs: error: mount_options: mount_options_stub: /dev/root: No such file or directory guestmount: some filesystems could not be mounted (ignored) fuse: bad mount point `mnt': Input/output error Debug output attached. cheers, Pádraig.