Comment 11 for bug 1298281

I saw this crash too, but it is unrelated. Instead it could be because newest version of libgtk2-perl and its dependencies are not all installed on the system.
From apt-term.log, we can see that libgdk-pixbuf2.0-0 is already unpacked but libgtk2-perl itself and its other dependencies are still at previous version. So when the gnome frontend is called by the trigger libgtk2-perl cannot be loaded.

""""
[...]
Preparing to replace libgdk-pixbuf2.0-common 2.26.1-1 (using .../libgdk-pixbuf2.0-common_2.30.6-1_all.deb) ...
Unpacking replacement libgdk-pixbuf2.0-common ...
[...]
Unpacking replacement libgdk-pixbuf2.0-0 ...
[...]
Unpacking replacement liblzma5 ...
Processing triggers for fontconfig ...
Processing triggers for libglib2.0-0 ...
Processing triggers for gconf2 ...
Processing triggers for man-db ...
debconf: unable to initialize frontend: Gnome
debconf: (Unable to load Gtk -- is libgtk2-perl installed?)
""""