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Change Theme

  1. Find a wallpaper, like the one here.
  2. Copy it under /usr/share/backgrounds/:
    $ sudo mkdir /usr/share/backgrounds/debian
    $ sudo cp wallpaper.svg /usr/share/backgrounds/debian
  3. Edit GDM3 configuration:
    $ sudo cp /etc/gdm3/greeter.gconf-defaults /usr/share/gdm/greeter-config/99_personal
    $ gksudo gedit /usr/share/gdm/greeter-config/99_personal

    After ‘/desktop/gnome/background/picture_filename’, set the path to your wallpaper.
    After ‘/desktop/gnome/background/picture_options’, set ‘center’.
    It is also possible to modify the GTK and/or icon themes used.
    One can also add an icon with the option ‘/apps/gdm/simple-greeter/logo_icon_name’
  4. Validate the configuration:
    $ sudo dpkg-reconfigure gdm3
  5. Restart Gnome session

Automatic user connection

  1. Edit daemon.conf:
    $ sudo gedit /etc/gdm3/daemon.conf
  2. In section [daemon], put the following options:

    with USER a valid user login

Sources: See here, here and here.


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