Comment 5 for bug 1729034

Public ubuntu-cpc builds check out (except that s390x hasn't built because apparently this isn't a devirt ppa).

Private cloud image builds, for those with access, are at <https://launchpad.net/~cloudware/+livefs/ubuntu/xenial/cpc-development/+build/113981>. These show the expected behavior; the derivative image builds are not using the divert_grub entry point in this revision, so the /boot/grub/grub.cfg is currently wrong for some of these images, but this is not a regression and will be fixed in a later revision of the derived image build code.