Comment 4 for bug 1799736

This is now uploaded to xenial. Please note that some of the changes have not yet been released into bionic - but that's intended. I would like to request that the xenial livecd-rootfs of this SRU land first, before we prepare bionic. The reason for that is that currently, thanks to bionic missing these changes, we can use this series to temporarily build core16 images. Otherwise we'd have no easy way of doing that before the xenial livecd-rootfs fully migrates into updates (and right now that's still needed).