GTK GUI missing

(Noobie … I originally posted the following in the “Install” forum. A new thread here has been suggested.)

When running “Online Update”, at termination I receive a panel with

GTK GUI wanted but not found, falling back to Qt.

No further messages are seen after pressing “Close”. Pursuant to this thread, I ran (as “root”) “ZYPPER Verify”, and received the message that all dependencies are satisfied. However, the original message still presents after each attempt at online update.