Partially phased updates on release media

[Julian Andres Klode]

On Wed, May 19, 2021 at 03:59:06PM -0700, Brian Murray wrote:
> The release team was recently discussing the possibility of point
> release media containing updates which are not fully phased and how this
> creates a difference between upgraded systems and freshly installed
> ones[1]. Looking at the packages which are not currently phasing[2] I've
> discovered that the 16.04.7 installation iso contains
> unity-control-center 15.04.0+16.04.20171130-0ubuntu1 and the 18.04.5 iso
> contains nautilus 1:3.26.4-0~ubuntu18.04.5. To ensure that both types of
> systems are the same I think we should fully phase these two packages.
> 
> Additionally, a step should be added to the point release process to nag
> the uploader of a package which has stopped phasing to investigate the
> reasons for the stoppage well before (2 weeks?) the point release.  If
> the package is still not fully phased in time for the point release then
> the release team should make a decision about fully phasing it or
> reverting to the previous version of the package.

I just filed https://bugs.launchpad.net/launchpad/+bug/1929082 against
launchpad to keep the previous version of the update in updates while
a new one is being phased.

This would then allow image builders to set the never-include-phased-updates
option in apt.conf, and then images will always build with whatever is
fully phased, and we don't have to take as much special care (just need
to disable phasing changes during image building time) for future LTS
releases.

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