For the record this was fixed in Hirsute with a different bug number:
gnome-shell (3.38.3-3ubuntu2) hirsute; urgency=medium
[ Didier Roche ]
[ Jean-Baptiste Lallement ]
* debian/patches/ubuntu/configure_login_screen.patch:
Make GDM background configurable with gsettings (LP: #1918613)
-- Didier Roche <didro...@ubuntu.com> Thu, 25 Mar 2021 10:44:17 +0100
** Changed in: gnome-shell (Ubuntu Focal)
Status: New => Fix Committed
** Tags added: verification-needed verification-needed-focal
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https://bugs.launchpad.net/bugs/1929536
Title:
[SRU] GDM background configurable with gsettings
Status in gnome-shell package in Ubuntu:
Fix Released
Status in gnome-shell source package in Focal:
Fix Committed
Bug description:
[Description]
Customization of the greeter is a requirement from Corporate customers.
Currently the background (plain color or image) of the greeter is hard
coded in the style embedded in the theme. Customizing this background
requires to extract the style sheet from gnome-shell gresource file,
modify it manually, recompile and deploy the new gresource, and add an
alternative to it.
This feature adds 4 gsettings keys to make the background of the
greeter configurable via gsettings. The default value defined the in
the theme is used for keys that are not set.
[Test Case]
1. Boot a desktop session
2. Verify that the default aubergine background is displayed in the greeter.
3. Login as the administrator of the machine
4. Install systemd-container
5. Switch to the GDM user:
$ sudo machinectl shell gdm@ /bin/bash
6. Apply a different background with the command:
$ gsettings set com.ubuntu.login-screen background-picture-uri
'file:///usr/share/backgrounds/warty-final-ubuntu.png'
7. Logout
8. Verify that the image 'warty-final-ubuntu.png' is displayed as the
background of the greeter.
[Risks / Impact]
The changeset is minimal, isolated (Only the code of the greeter is impacted
by the change.) and can be easily reverted.
In case of error in the code, GDM will fail to load and it will be
immediately visible.
[Build]
Builds and tested successfully locally.
Besides the updated JS is not compiled as part of build.
[Upstream Issue]
https://gitlab.gnome.org/GNOME/gdm/-/issues/684
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