/usr/share/gconf/defaults/10_muffin-common is in muffin-common 1.7.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | /desktop/gnome/keybindings/custom0/action x-terminal-emulator
/desktop/gnome/keybindings/custom0/binding <Primary><Alt>t
/desktop/gnome/keybindings/custom0/name "Launch Terminal"
|