"Dummy Output" listed as sound device in 18.04
76742
Persistent Dummy Output
24591
Automatically change Sound Input Output device
133899
Any use for a sound card these days?
42981
Will proprietary software-based sound enhancements work with Ubuntu? (BeatsAudio, Dolby)
8983
How can I easily switch audio output in Ubuntu 17.10 and later with GNOME?
90263
How to play audio?
119810
How do I capture the audio that is being played?
27308
How can I change the default audio device from command line?
144174
Creating virtual Audio device
35819
Ubuntu 18.04 audio disappeared after update
130127
Shortcut to switch  between Analog Stereo output & HDMI audio output
88553
"Unknown Audio Device"
61994
How do I change which audio jacks are used for input and output?
109898
Is it possible to use USB output and audio port output at the same time?
88109
Why my DAC works without GND and VCC?
38905
How to disable pulseaudio automatic device switch?
35137
Why do I only hear sound from the speakers with A2DP headset connected?