Can't access preferences or run experiments on Ubuntu 20.04

Other
6

Thank you. After downgrading I got a different error message, so I followed a suggestion in this thread and uninstalled psychtoolbox completely. It has helped, now I can run experiments, but I still can’t access preferences (the error message is the same as before) and the icon is still a glitch. Do I lack some libraries? Should I reinstall something? Should I report it somewhere?