No sound in kubuntu 24.04

I had an installation of kubuntu 23.10 where musescore 4.3 worked. Now that I made a fresh install of kubuntu 24.04 at the same machine without changing any hardware musescore 4.3 has no sound anymore. When I type otes they don't make sound. When I play the score the cursor doesn't move. I deleted all config files of all folders nut nothing works. I can't choose audio device in MU 4.3 because the only option that appears in preferences is system default.