Comment 12 for bug 1906266

Ran the test plan on focal which produced the following error:

ERROR Requested operation is not valid: format of backing image '/var/lib/libvirt/images/base/focal-server-cloudimg-amd64' of image '/var/lib/libvirt/images/testinst/root.img' was not specified in the image metadata (See https://libvirt.org/kbase/backing_chains.html for troubleshooting)
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start testinst
otherwise, please restart your installation.

Ran the test plan on focal with libvirt packages from ppa:ci-train-ppa-service/4591.
The domain booted successfully.