Stefan Krusche composed on 2018-08-04 12:13 (UTC+0200): > Felix Miata composed: >> # dpkg -l | grep gtk >> ii gtk3-tqt-engine-trinity 4:14.1.0~s12-0ubuntu18.04.0+3~a amd64 GTK3 theme engine for TDE >> ii gtk-qt-engine-trinity 4:14.1.0~s14-0ubuntu18.04.0+3~a amd64 theme engine using Qt for GTK+ 2.x and Trinity >> ii gtk-update-icon-cache 3.22.30-1ubuntu1 amd64 icon theme caching utility >> ii kgtk-qt3-trinity 4:14.1.0~s14-0ubuntu18.04.0+1 amd64 Use TDE dialogs in Gtk apps >> ii libcanberra-gtk3-0:amd64 0.30-5ubuntu1 amd64 GTK+ 3.0 helper for playing widget event sounds with libcanberra >> ii libgtk2.0-0:amd64 2.24.32-1ubuntu1 amd64 GTK+ graphical user interface library >> ii libgtk2.0-bin 2.24.32-1ubuntu1 amd64 programs for the GTK+ graphical user interface library>> ii libgtk2.0-common 2.24.32-1ubuntu1 all common files for the GTK+ graphical user interface library >> ii libgtk-3-0:amd64 3.22.30-1ubuntu1 amd64 GTK+ graphical user interface library >> ii libgtk-3-common 3.22.30-1ubuntu1 all common files for the GTK+ graphical user interface library >> ii libgtkmm-3.0-1v5:amd64 3.22.2-2 amd64 C++ wrappers for GTK+ (shared libraries) >> # /usr/local/ffe60/firefox -P ffe60 >> (firefox:27799): Gtk-ERROR **: 04:42:18.938: GTK+ 2.x symbols detected. >> Using GTK+ 2.x and GTK+ 3 in the same process is not supported >> ExceptionHandler::GenerateDump cloned child 27805 >> ExceptionHandler::SendContinueSignalToChild sent continue signal to child >> ExceptionHandler::WaitForContinueSignal waiting for continue signal... >> Trace/breakpoint trap >> (crashreporter:27810): Gtk-ERROR **: 04:42:19.016: GTK+ 2.x symbols >> detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported >> Anyone recognize whether this is a bug or missing or conflicting package? >> If missing or conflict, which? > have you tried to remove kgtk-qt3-trinity? Sl�vek gave me this advise two or > three times in the past in similar cases which I don't remember exactly now, > but where also gtk2/gtk3-related... For me that solved it, then. Happened to me many times, but I never remember the name of that package. It worked again this time too. Thanks! Now I need to figure out which package presence or absence is making the Firefox UI inverse colors. :-p -- "Wisdom is supreme; therefore get wisdom. Whatever else you get, get wisdom." Proverbs 4:7 (New Living Translation) Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! Felix Miata *** http://fm.no-ip.com/