Comment 32 for bug 199960

Unfortunately these backtraces are still incomplete (they show debug symbols for Xorg calls but not for gnome-settings-daemon or gnome-desktop), so it is hard to tell where the crash is starting. Please add "deb http://ddebs.ubuntu.com gutsy main universe" to your sources and install the packages libgtk2.0-0-dbgsym libgnome-desktop-2-dbgsym and gnome-settings-daemon-dbgsym.