No default background set for GNOME-Greeter

[Matthew Hagemann]

[ 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.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-settings - 24.10.3

---------------
ubuntu-settings (24.10.3) oracular; urgency=medium

  * Set default background in GDM gnome-initial-setup session.
    Use ubuntu default background when using the GNOME greeter session that
    is default when using gnome-initial-setup from GDM (LP: #2077741)

 -- Marco Trevisan (Treviño) <email address hidden> Thu, 29 Aug 2024 19:37:09 +0200

[Robie Basak (racb)]

Accepting. I see that the change is scoped to "[org.gnome.desktop.background:GNOME-Greeter]" so I guess there's low likelyhood of impact outside that, but for testing, to what extent do we need to consider other flavours that use gnome-greeter?

[Robie Basak (racb)]

Hello Matthew, or anyone else affected,

Accepted ubuntu-settings into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/ubuntu-settings/24.04.5 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Jeremy Bícha (jbicha)]

gnome-initial-setup is currently seeded by Ubuntu Desktop and Edubuntu only.

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted ubuntu-settings (24.04.5) for noble have finished running.
The following regressions have been reported in tests triggered by the package:

network-manager/1.46.0-1ubuntu2 (arm64)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/noble/update_excuses.html#ubuntu-settings

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[Matthew Hagemann (matt-hagemann)]

Tested version 24.04.5 from https://launchpad.net/ubuntu/+source/ubuntu-settings/24.04.5

Following the first few steps in the testplan https://wiki.ubuntu.com/DesktopTeam/TestPlans/GnomeInitialSetup I:
- Created a 24.04.1 VM and preformed normal installation
- Installed ubuntu-settings 24.04.5
- Removed the user created during installation
- Rebooted the VM

I landed on the Gnome-Initial-Setup session, but now including the wallpaper, fixing my issue. I was able to complete the setup flow as per normal.