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yes. there most probably are conflicts with the *old* kxstudio repos!

1. you should move to the newer ones anyway, but first remove/purge the old ones (not the packages though, only the apt sources).
2. then install the new kxstudio ones--please follow the instructions in https://kx.studio/Repositories ...
3. remove/uninstall any of the qstuff there still remaing...
4. update and install new qstuff at will :)

hth.
byee

ps. disclaimer: no debian/ubuntu expert here, so please forgive me anything ;)