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can't help you there, I'm no apt expert nor am I a regular user at all :) maybe you can try remove qsampler and qsynth and then re-install them?

oh, note that there are some dependencies on qsampler to liblscp6 and libgig10, and qsynth to libfluidsynth3, that your system may have not there (but it could, if you go with my additional ppa:rncbc/libs-focal)... but please do not bother with that, keep the official/installed/non-upgradeable versions though, to keep you on the safe side and not breaking your eco-system ;)

byee