Quoting from #ubuntu-devel on IRC:

jackpot51 | didrocks: I am going to work on 
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1715722 with the 
method I described first, having alternatives for a gdm.css file that is the 
stylesheet of GDM
jackpot51 | It is critical to our Beta release that we have a reliable method 
of overriding the GDM theme, so the alternatives method seems to be the best 
way to go. We can talk about further improvement and upstreaming after 17.10
jackpot51: I think it will need a FFe though
jackpot51 | In my mind, it isn't a feature
jackpot51 | It is a bug fix for a bug affecting flavors of Ubuntu using GNOME
didrocks | jackpot51: you meant "deratives" rather than flavors? I don't know 
of any existing 17.10 flavors using gdm?
jackpot51 | Yes, that is what I mean - derivatives
jackpot51 | If this becomes too complicated, we would have to fork the 
gnome-shell package to accomplish what we need to in Pop before 17.10
jackpot51 | So I would like to do this as simply and smartly as possible        
                                       
didrocks | jackpot51: I guess you just need to talk to the release team telling 
us you want to do a temporary override until we get a better upstreamable 
solution and see if they consider it's a FF breakage or not
Laney | where does this pop.css come from?                                      
                                 
jackpot51 | Ok, that sounds good to me                                          
                                     
Laney | I think it'd be easier for you to dpkg-divert the ubuntu one away if 
this is a temporary solution for one derivative only

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1715722

Title:
  Allow safe override of GDM3 theme

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  Currently, in artful, GDM3's theme is hardcoded to be /usr/share
  /gnome-shell/theme/ubuntu.css

  In the Ubuntu default session, this is the same CSS file as the gnome-
  shell mode in /usr/share/gnome-shell/modes/ubuntu.json

  However, in other flavors, it makes sense to install another mode json
  and theme css file with a clear name. Take, for instance, pop-session,
  that installs /usr/share/gnome-shell/theme/pop.css and /usr/share
  /gnome-shell/modes/pop.json

  In order to supply a custom GDM3 theme, which is currently hardcoded,
  the ubuntu.css file must be replaced with this pop.css file. This
  breaks ubuntu-session, causing it to have a different shell theme than
  expected.

  What would be desirable is for the GDM3 CSS file to be hardcoded to
  gdm.css, which would be a symlink to the correct stylesheet for the
  flavor. This would allow multiple GNOME Shell sessions to be installed
  at the same time.

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