In his blog Bruce Byfield takes Debian's default gdm3 wallpaper (or rather his aim to change the wallpaper) as an example for lack of documentation: "I wanted to get rid of the nauseatingly cute default Debian 6.0 wallpaper on the login screen." [...] "Finally, after an hour of scanning pages and trying what three or four procedures, each of which, the writer confidently assured me, was the right answer, I manage to cobble together a simple four-step procedure from suggestions that, while often unclear or incomplete, were close to being accurate that experimentation could correct them: 1. Log in as root and open the file /etc/gdm3/greeter.gconf-defaults in a text editor. 2. Uncomment the field /desktop/gnome/background/picture_filename and add as its value the full path to the image you want to use as gdm3's background. 3. Uncomment the field /desktop/gnome/interface/gtk_theme and add a valid theme. Then save and close the file. 4. Run the command dpkg-reconfigure gdm3. Simple? Yes, once you know how. But that simple task had taken me ten times longer to do than I expected -- and all because nobody could be bothered to write down the procedure." http://www.linux-magazine.com/content/view/full/47500
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