Ubuntu 21.10 could invoke Quodlibet. Ubuntu 22.04 cannot.
If anybody knows how to invoke (ie start) Quodlibet on Ubuntu 22.04, please provide instructions. Thanks!
I, too, hit this issue with quodlibet version 4.4.0-2 after updating to Ubuntu 22.04, and prepared a patch that has since been released into the jammy-updates repository as version 4.4.0-2ubuntu0.1. If you have it enabled, the updated package should soon be made available in your mirror of the Ubuntu archive.
You can see the Launchpad bug here: https://bugs.launchpad.net/ubuntu/+source/quodlibet/+bug/1964791
Hope this helps!
Adding the correct ppa enables the install for the newest release:
sudo add-apt-repository ppa:lazka/ppa
sudo update
sudo apt install quodlibet