UbuntuStudio/TroubleShooting - Community Help Wiki
TroubleShooting Q/A
Help! JACK is not able to shut down cleanly
If the audio session gets stuck, use Ubuntu Studio Audio Configuration to restart or reconfigure the audio stack, or log out and back in. Current releases use PipeWire for desktop audio, so the old JACK-specific workaround is no longer relevant.
killall -9 jackd
## I can't seem to get sound when I use qjackctl
If you can start jack, but there's no sound, there are two likely reasons for this.
- If you have multiple audio devices, you need to make sure to choose the right device after each boot in Qjackctl -> Setup -> Interface
- Your audio device is muted, but the controls aren't visible in the desktop mixer. For PCI and USB, use alsamixer or a specific mixer for your device. For FireWire use ffado-mixer.
# See also