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Change GDM background in GNOME 3.2

Suppose you wish to change the background for GDM (GNOME Display Manager) to /usr/share/backgrounds/zim2687.jpg. Here is how to do it: # xhost +SI:localuser:gdm # sudo -u gdm gsettings set org.gnome.desktop.background picture-uri ‘file:////usr/share/backgrounds/zim2687.jpg’ # xhost -SI:localuser:gdm Log out and you should see the new background when GDM restarts.