Procedure

1. Create a local database for machine-wide settings in /etc/dconf/db/local.d/00-background:

   # Specify the dconf path
   [org/gnome/desktop/background]
   
   # Specify the path to the desktop background image file
   picture-uri='file:///usr/local/share/backgrounds/wallpaper.jpg'
   # Specify one of the rendering options for the background image:
   # 'none', 'wallpaper', 'centered', 'scaled', 'stretched', 'zoom', 'spanned'
   picture-options='scaled'
   # Specify the left or top color when drawing gradients or the solid color
   primary-color='000000'
   # Specify the right or bottom color when drawing gradients
   secondary-color='FFFFFF'

2. Optionally, if you want a user to not be able to change the default background, override the user’s setting in the /etc/dconf/db/local.d/locks/background file:

   # List the keys used to configure the desktop background
   /org/gnome/desktop/background/picture-uri
   /org/gnome/desktop/background/picture-options
   /org/gnome/desktop/background/primary-color
   /org/gnome/desktop/background/secondary-color

3. Update the system databases:

   # dconf update

4. Users must log out and back in again before the system-wide settings take effect.

Procedure

1. Use the org.gnome.desktop.background schemas to create a file in the xml format specifying your extra background’s appearance.

   Table 8.1. Frequently used org.gnome.desktop.background schemas GSettings Keys

   Key Name	Possible Values	Description
   picture-options	"none", "wallpaper", "centered", "scaled", "stretched", "zoom", "spanned"	Determines how the image set by wallpaper_filename is rendered.
   color-shading-type	"horizontal", "vertical", and "solid"	Determines shade the background color.
   primary-color	default: #023c88	Left or Top color when drawing gradients, or the solid color.
   secondary-color	default: #5789ca	Right or Bottom color when drawing gradients, not used for solid color.

   The full range of options can be found in the dconf-editor GUI or the gsettings command-line utility. For more information, see Section 6.3, “Displaying GSettings values for desktop applications”.

2. Store the *.xml file under the /usr/share/gnome-background-properties/ directory.

Procedure

1. Create a gdm database for machine-wide settings in /etc/dconf/db/gdm.d/01-screensaver:

   [org/gnome/desktop/screensaver]
   picture-uri='file:///opt/corp/background.jpg'

   Replace /opt/corp/background.jpg with the path to the image file you want to use as the screen shield. Supported formats are PNG, JPG, JPEG, and TGA. Note that the image will be scaled if necessary to fit the screen.

2. Update the system databases:

   # dconf update

3. Users must log out and back in again before the system-wide settings take effect.

1. Make sure that you have updated the system databases by running the dconf update command as the root user.
2. Try restarting GDM.

Procedure

1. Create a local database file for machine-wide settings in /etc/dconf/db/local.d/00-extensions:

   [org/gnome/shell]
   # List all extensions that you want to have enabled for all users
   enabled-extensions=['myextension1@myname.example.com', 'myextension2@myname.example.com']

   The enabled-extensions key specifies the enabled extensions using the extensions' uuid (myextension1@myname.example.com and myextension2@myname.example.com).

2. Update the system databases:

   # dconf update

3. Users must log out and back in again before the system-wide settings take effect.

   Note

   There is currently no way to enable additional extensions for users who have already logged in. This does not apply for existing users who have installed and enabled their own GNOME extensions.

Procedure

1. Create a local database file for machine-wide settings in /etc/dconf/db/local.d/00-extensions:

   [org/gnome/shell]
   # List all extensions that you want to have enabled for all users
   enabled-extensions=['myextension1@myname.example.com', 'myextension2@myname.example.com']

   The enabled-extensions key specifies the enabled extensions using the extensions' uuid (myextension1@myname.example.com and myextension2@myname.example.com).

2. Override the user’s setting and prevent the user from changing it in /etc/dconf/db/local.d/locks/extensions:

   # Lock the list of mandatory extensions
   /org/gnome/shell/enabled-extensions

3. Update the system databases:

   # dconf update

4. Users must log out and back in again before the system-wide settings take effect.

Procedure

1. Create a local database file for machine-wide settings in /etc/dconf/db/local.d/00-extensions-mandatory:

   [org/gnome/shell]
   # List all mandatory extensions
   enabled-extensions=['myextension1@myname.example.com', 'myextension2@myname.example.com']

   The enabled-extensions key specifies the enabled extensions using the extensions' uuid (myextension1@myname.example.com and myextension2@myname.example.com).

2. Override the user’s setting and prevent the user from changing it in /etc/dconf/db/local.d/locks/extensions-mandatory:

   # Lock the list of mandatory extensions
   /org/gnome/shell/enabled-extensions

3. Update the system databases:

   # dconf update

4. Users must log out and back in again before the system-wide settings take effect.