Thanks all very much! Special thanks to takluyver whose sympy packages I
have used from Launchpad earlier. ☺
'pip3 install qtconsole' followed by 'jupyter qtconsole' works fine for me.
I also created the following Jupyter-Console.desktop file and put it in
~/.local/share/applications/ to get it in my KDE apps menu:
Comment=Starts the Jupyter QtConsole
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