Instead of restarting Ubuntu you can restart PulseAudio from terminal: pulseaudio -k (wait a few seconds) pulseaudio
Disappearing PulseAudio output devices can happen when using Firejail. https://firejail.wordpress.com/support/known-problems/#pulseaudio -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1594570 Title: System Settings | Sound empty device list and no sound in video player, after reboot it works fine To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1594570/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
