Hi Karlheinz, yep, that's a bug, a student of mine hit the same :) Volker Schroer fixed that upstream[1] and it's included in GNU Radio 3.10.2.0.
Sadly, I don't think this has trickled down into Ubunut's packaging yet.If you feel adventurous (notice that I'm usually strongly opposing fiddling with system-installed data, but here, it does seem like an easy enough fix), by replacing line 79 in
"/usr/lib/python3/dist-packages/gnuradio/qtgui/ledindicator.py", the line becomes self.setMinimumSize(int(maxWidth), int(maxHeight)) (make very sure not to change the indentation of the file). Best regards, Marcus [1] https://github.com/gnuradio/gnuradio/pull/5541/files
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