$ gdebi-gtk '/home/doug/Desktop/bzr_2.4.1-1ubuntu1_all.deb' 

Gtk-WARNING **: drawing failure for widget `GtkProgressBar': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkHBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkVBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkWindow': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkProgressBar': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkHBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkVBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkWindow': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkProgressBar': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkHBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkVBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkWindow': invalid matrix (not invertible)
Traceback (most recent call last):
  File "/usr/share/gdebi/GDebi/GDebi.py", line 393, in on_treeview_files_cursor_changed
    name = model[path][0]
  File "/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py", line 730, in __getitem__
    aiter = self.get_iter(key)
  File "/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py", line 744, in get_iter
    path = TreePath(path)
  File "/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py", line 1110, in __new__
    if len(path) == 0:
TypeError: object of type 'NoneType' has no len()

Gtk-WARNING **: drawing failure for widget `GtkProgressBar': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkHBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkVBox': invalid matrix (not invertible)

Gtk-WARNING **: drawing failure for widget `GtkWindow': invalid matrix (not invertible)

Gtk-WARNING **: Failed to set text from markup due to error parsing markup: Error on line 1 char 100: '=' is not a valid character following a '<' character; it may not begin an element name