hi again, thanks dirk for your previous answer. i move this little issue to a new thread, as the conditions changed. i do have an ubuntu desktop machine for testing, so i went ahead and installed ros-groovy-desktop plus -rqt. this went well. alas, $ rosrun rqt_gui rqt_gui doesn't serve me, because "qt_gui" isn't found. the "qt_gui*" directories do reside in /opt/ros/groovy/share though. gladly accepting any hints. bst, opt -- Sent from my fingertip ...