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First of all, if the AppImage works for you, the warnings are the least of it.

But it's a shame that you're missing out on the Calf suite and Carla plugin. I think that's the only drawback of the AppImage in Qtractor.

AppImages tend to create strange errors and warnings, because their approach is a bit botched. They "replace" the system libraries with their own by recreating them in a temporary file. And this can lead to unexpected results with pathfinding when plugins and third-party applications come into play.
The plugin will try to call its own dependencies in the system paths, but the program will take it to a different place where the system dependencies and paths are not, but those of the program.
At least that's the conclusion I've come to, and that would explain the warnings.
I could be wrong. I'm sure Rui will clear up our doubts.

The installed application is more recommendable.
Although I insist, if the AppImage works well for you, everything is fine.

There are 3 installers for Ubuntu.
I don't know if you've tried all 3, sometimes you get lucky and one of them matches your system dependencies.
Another option is to install by compiling. It's not as difficult as it seems.
https://sourceforge.net/p/qtractor/wiki/How%20To%20-%201%20Compile%20Qtr...