The log mentions /usr/bin/gnome-session.real which doesn't exist on an Ubuntu desktop. Where did you get it? Could you run "dpkg -l gnome-session", "dpkg -S /usr/bin/gnome-session.real" and "ls -l /usr/bin/gnome-session.real" and copy that to a comment? Could you also get a valgrind log with gnome-session-dbgsym libglib2.0-0-dbg libgtk2.0-0-dbg installed?
The log mentions /usr/bin/ gnome-session. real which doesn't exist on an Ubuntu desktop. Where did you get it? Could you run "dpkg -l gnome-session", "dpkg -S /usr/bin/ gnome-session. real" and "ls -l /usr/bin/ gnome-session. real" and copy that to a comment? Could you also get a valgrind log with gnome-session- dbgsym libglib2.0-0-dbg libgtk2.0-0-dbg installed?