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In Ubuntu Studio 23.10 I have qtractor built from one of the latest git updates. As an experiment, I tried 'sudo cmake --install build' in Ubuntu Unity 20.04, which I have on the same machine; (both OS versions share the same /home partition). I wanted to see what sort of error the newly installed qtractor would produce. What I got was 'qtractor: error while loading shared libraries: libQt6Widgets.so.6: cannot open shared object file: No such file or directory'.

Unfortunately I can't find libQt6Widgets.so.6 anywhere, nor can I find qt6ct. So I'm still stuck. Can you point me in the right direction?