** Description changed:

  [ Impact ]
  
  While using Gnome-Initial-Setup launched from GDM (when no user > 1000
  is present on the machine), no background is set on GNOME-Greeter,
  leading to a solid blue background wallpaper.
  
  Gnome-Initial-Setup is currently used on OEM shipped devices to provide
  a first user setup flow. We plan to also use it for a Raspberry Pi first
  user flow. We have received lots of feedback that the solid blue
  background is not in line with the Flutter installer and looks like an
  error occurred / the wallpaper failed to load.
  
  By updating /usr/share/glib-2.0/schemas/10_ubuntu-
  settings.gschema.override with:
  
  ```
  # for GDM/DM
  # FIXME: move to :Ubuntu-Greeter once upstream supports this, see LP: #1788
  
  [org.gnome.desktop.interface:GNOME-Greeter]
  gtk-theme = 'Yaru'
  icon-theme = 'Yaru'
  cursor-theme = 'Yaru'
  font-name = 'Ubuntu 11'
  monospace-font-name = 'Ubuntu Mono 13'
  font-antialiasing = 'rgba'
  
  [org.gnome.login-screen]
  logo='/usr/share/plymouth/ubuntu-logo.png'
  
  + [org.gnome.desktop.background:GNOME-Greeter]
  + picture-uri = 'file:///usr/share/backgrounds/warty-final-ubuntu.png'
  + picture-uri-dark = 'file:///usr/share/backgrounds/ubuntu-wallpaper-d.png'
  + show-desktop-icons = false
  ```
  
  I was able to add in one. This will help improve the GIS installer flow
  for Raspberry Pi we plan to support in 24.10 and the OEMs
  
  ubuntu-settings:
    Installed: 24.04.3
  Ubuntu version: 24.04 LTS
  
  [ Test Plan ]
  
  To test this change, you can follow the test plan for Gnome-Initial-
  Setup up to the point where you have launched the GDM Gnome-Initial-
  Setup session and Gnome-Initial-Setup has appeared. You should see the
  default Ubuntu wallpaper, not a solid blue wallpaper, behind Gnome-
  Initial-Setup.
  
  https://wiki.ubuntu.com/DesktopTeam/TestPlans/GnomeInitialSetup
+ 
+ 
+ [ Where problems could occur ]
+ 
+ If the path to the wallpaper is invalid, the session reverts to its blue
+ background, returning to its current state.

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2077741

Title:
  No default background  set for GNOME-Greeter

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