I upgraded from 18.04 to focal and had the same problem. Purging timidity got audio back for me as well.
** Tags added: champagne focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1793640 Title: Pulseaudio fails to detect sound card, while timidity is installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/timidity/+bug/1793640/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
