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hi,

please make sure you build/compile with ALL the recommended requirements, most especially all the LV2 development support libraries and stuff:

and then try again from ./configure ... && make, etc.

instead of building or compiling the source altogether, you can add one of my Launchpad PPA repositories, from where you get the latest and fully-featured upstream snapshots of all of the qstuff, not only qtractor; in your case, if you're on UbuntuStudio 20.04, I recommend you to xUbuntu_20.04 (focal):

good luck! :)

hth.
cheers