The revelant place is probably /usr/share/gconf if you want to look for the default. Note than we don't modify the upstream schemas but Debian,Ubuntu packages can set a default that is registered during the installation, it makes easy for CDD distributions to change a key by example. The gnome-session one is /usr/share/gconf/defaults/10_gnome-session and it lists "/apps/gnome-session/options/splash_image splash/ubuntu-splash.png", so if there is an issue that's likely to be a gconf distro specifc one rather that due to gnome-session
The revelant place is probably /usr/share/gconf if you want to look for the default. Note than we don't modify the upstream schemas but Debian,Ubuntu packages can set a default that is registered during the installation, it makes easy for CDD distributions to change a key by example. The gnome-session one is /usr/share/ gconf/defaults/ 10_gnome- session and it lists "/apps/ gnome-session/ options/ splash_ image splash/ ubuntu- splash. png", so if there is an issue that's likely to be a gconf distro specifc one rather that due to gnome-session