It appears your pulseaudio is not running, which is why there is no
sound:
!!Sound Servers on this system
!!----------------------------
Pulseaudio:
Installed - Yes (/usr/bin/pulseaudio)
Running - No
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https://bugs.launchpad.net/bugs/1788471
Title:
There is no sound when you turn on the tube. Sometimes the sound is. I
do not understand why this is so
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