It appears you don't have a pulseaudio daemon running, which would explain the loss of all output and input.
Please look in /var/crash for any relevant crash files. If found then follow the instructions in https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment Otherwise, please check this page to see what crash reports the machine has automatically sent: https://errors.ubuntu.com/user/ID where ID is the contents of the machine's /var/lib/whoopsie/whoopsie-id file. ** Changed in: pulseaudio (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774979 Title: no input and output devices detected in sound definitions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1774979/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
