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[ubuntu/bionic-proposed] update-manager 1:18.04.11 (Accepted)

On Fri, Apr 13, 2018 at 12:17:16PM -0700, Steve Langasek wrote:
> On Fri, Apr 13, 2018 at 02:53:13PM -0400, Jeremy Bicha wrote:
> > On Fri, Apr 13, 2018 at 1:13 PM, Brian Murray <brian at> wrote:
> > > Why is it necessary to modify individual packages so that GNOME
> > > Software won't uninstall them?
> > > Is update-manager being a dependency of ubuntu-desktop not enough to
> > > prevent it from being uninstalled?
> > Thank you for asking.
> > GNOME Software does not notify the user about dependencies that will
> > be uninstalled. Packages and dependencies are details that are not
> > exposed at all to users of GNOME Software.
> > > If it is necessary to modify every package which a metapackage depends
> > > on how is this work being tracked?
> > Nothing is tracking this. I am making sure that the AppStream metadata
> > is in place and set correctly for ubuntu-desktop only. The apps that
> > are depends of ubuntu-desktop are gnome-control-center, nautilus,
> > software-properties-gtk, update-manager, and yelp. Recommends are not
> > a problem as they can be removed without removing the metapackage.
> > (I have also removed the compulsory-for-GNOME tag from epiphany and totem.)
> > This has been an issue since Ubuntu 16.04 LTS but it wasn't a big
> > enough priority to anyone to fix until now.
> > I wasn't planning on backporting this to 16.04 but it could be done by
> > someone.
> I am concerned about the model here by which individual packages need to add
> blobs of metadata on the filesystem to declare themselves "not for removal".
> This is completely disconnected from the existing logic for managing
> metapackages, which is expressed through the central Packages files and
> apt's logic for metapackage dependencies.
> Why is GNOME Software removing dependencies of packages /at all/?  Why are
> the decisions about dependency removal not being delegated to apt, instead
> of being reimplemented poorly?

I don't believe PackageKit/GNOME Software does anything different here. 
What happens is that e.g. ubuntu-desktop depends on nautilus, but if you
remove nautilus, ubuntu-desktop is removed too. That's the same in APT
and PackageKit. 

What I feel like should happen is to automatically generate compulsory
metadata in appstream generator from task fields or something.

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