New lubuntu user here. Just completed my installation and realized there is no audio playing. Tried googling around but non of the solutions worked. I reinstalled pulseaudio and pavucontrol as well.
Pavucontrol output shows dummy output while alsamixer shows the following screen.
One of the standard troubleshooting guides is SoundTroubleshootingProcedure - Community Help Wiki Though being somewhat dated, it’s step 4 contains and provides a ton of information I find useful in troubleshooting (esp. giving details of your hardware that make finding solutions far quicker).
fyi: It was first in my startpage search using “troubleshooting sound ubuntu site:*.ubuntu.com” because I limit myself to official sources before I expand to sources I don’t know; lubuntu.me is also official
I’d firstly look at the output of sudo lshw -C sound or list-hardware of class=sound to see what driver is recognized/used by the kernel (esp. given you’ve found “Dummy Output” in pavucontrol).
Please note: Given the output of step 4 in the guide I linked is so large, provide a link to somewhere it’s located if you’d like us to help with it (eg. use |pastebinit or equivalent). Personally I’d just try the sudo lshw -C sound step first (going further only if needed)
The lshw shows no audio card is detected, which can also be seen in
1. [ 2.593961] [drm] HDaudio controller not detected, using LPE audio instead
2. [ 5.764750] lp: driver loaded but no devices found
and other messages, and why you see Dummy Output in pavucontrol etc. I have no experience with your hardware (intel sst), but the following maybe helpful
I see other links in my startpage.com search (inc. launchpad bugs & a linux mint forum post (4.15/18.04 equiv.) that may also be useful; the Mint link is the latest but I’m reluctant to paste link sorry; i mention it as it should be easy to find.