I have not really fixed this problem, but I did download the appimage and that works well.

Need help. LMMS is not starting. And I cannot figure out why. LMMS version 1.2.2 v12 (latest version for my distribution) Operating system - linux Terminal output *** WEAK-JACK: initializing *** WEAK-JACK: OK. (0) Notice: could not set realtime priority. Cannot load library /usr/lib/lmms/libcarlabas...