System-wide default settings can be set by providing a default for a key in a dconf profile. These defaults can be overridden by the user.
To set a default for a key, the user profile must exist and the value for the key must be added to a dconf database.
Create the user profile:
local is the name of a dconf database.
Create a keyfile for the local database which contains the default settings:
# dconf path [org/gnome/desktop/background] # dconf key names and their corresponding values picture-uri='file:///usr/local/share/backgrounds/wallpaper.jpg' picture-options='scaled' primary-color='000000' secondary-color='FFFFFF'
Update the system databases:
# dconf update
When the user profile is created or changed, the user will need to log out and log in again before the changes will be applied.
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