/usr/bin/gnome-language-selector:11:gtk_widget_translate_coordinates:_update_widget_coordinates:_gtk_gesture_update_point:gtk_gesture_handle_event:gtk_gesture_single_handle_event

The Ubuntu Error Tracker has been receiving reports about a problem regarding language-selector. This problem was most recently seen with package version 0.166~ja1, the problem page at https://errors.ubuntu.com/problem/49e8a6edf4d1373d4a60ba5ae63b6ab414a2de45 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.