[Bug 1795145] [NEW] Turn on background plugin by default (Ubuntu 18.10)

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Khurshid Alam (khurshid-alam):

In https://git.launchpad.net/~ubuntu-desktop/ubuntu/+source/ubuntu-
settings/tree/debian/ubuntu-settings.gsettings-override#n139

we have,

[org.gnome.settings-daemon.plugins.background:ubuntu]
active = false

which disables the plugin. Gnome-settings-daemon doesn't use that key
anymore (They are auto started by desktop files), But unity-settings-
daemon now requires it to be enabled by default due to recent changes in
lightdm and u-s-d

Lightdm now use AccountsService extension system for extended greeter
information (like wallpaper) used by unity-greeter
(https://github.com/CanonicalLtd/lightdm/commit/6015bce25f241e7580c03594d846769f8236232f)

And unity-settings-daemon now depends on new AccountsService method of
setting background file for unity greeter. (https://bazaar.launchpad.net
/~unity-settings-daemon-team/unity-settings-daemon/trunk/revision/4179)

How-to-reproduce:
------------------

1) First disable the background plugin if it is already enabled.

    gsettings set org.gnome.settings-daemon.plugins.sharing active false

2) Change the wallpaper from unity-control-center.

3) Log out. 
 
    Unity-greeter should reflect the change of wallpaper.
    
    But it doesn't.

4) Re-enable the background plugin.

    gsettings set org.gnome.settings-daemon.plugins.sharing active true

5) Change the wallpaper again and then log out.

    Unity-greeter now reflects the change in wallpaper properly.

** Affects: ubuntu-settings (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cosmic
-- 
Turn on background plugin by default (Ubuntu 18.10)
https://bugs.launchpad.net/bugs/1795145
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