Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 697, in on_remove_clicked
    self.remove_source(model.get_value(iter, LIST_ENTRY_OBJ))
  File "/usr/lib/python2.5/site-packages/softwareproperties/SoftwareProperties.py", line 496, in remove_source
    self.modified_sourceslist()
TypeError: 'bool' object is not callable