I just found a fix here: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1720519
You have to remove and reinstall alsa-base and pulseaudio. I figured it out when I tried to start pulseaudio directly, and got this error message: W: [pulseaudio] module.c: module-combine is deprecated: Please use module-combine-sink instead of module-combine! W: [pulseaudio] module-combine.c: We will now load module-combine-sink. Please make sure to remove module-combine from your configuration. E: [pulseaudio] module.c: Module "module-switch-on-connect" should be loaded once at most. Refusing to load. E: [pulseaudio] main.c: Module load failed. E: [pulseaudio] main.c: Hintergrunddienst konnte nicht initialisiert werden. After sudo apt-get remove --purge alsa-base pulseaudio sudo apt-get install alsa-base pulseaudio sudo alsa force-reload It works again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1728587 Title: No audio device after upgrade to Kubuntu 17.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1728587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs