* gnu/services/virtualization.scm (hurd-vm-disk-image): Use 'lookup-image-type-by-name' instead of referring to 'hurd-disk-image' from (gnu system images hurd).
* gnu/services/virtualization.scm (hurd-vm-disk-image): Use 'lookup-image-type-by-name' instead of referring to 'hurd-disk-image' from (gnu system images hurd).