*** This bug is a duplicate of bug 1876065 ***
https://bugs.launchpad.net/bugs/1876065
For me, upgrading from groovy helped
Add and uncomment lines to sources.list
#deb http://pl.archive.ubuntu.com/ubuntu/ groovy main restricted universe
multiverse
#deb http://pl.archive.ubuntu.com/ubuntu/ groovy-backports main restricted
universe multiverse
#deb http://pl.archive.ubuntu.com/ubuntu/ groovy-security main restricted
universe multiverse
#deb http://pl.archive.ubuntu.com/ubuntu/ groovy-updates main restricted
universe multiverse
#deb http://pl.archive.ubuntu.com/ubuntu/ groovy-proposed main restricted
universe multiverse
apt update
apt install libpulse0/groovy-proposed
apt install pulseaudio/groovy-proposed
! comment out those lines in sources.list again
! run apt update again
! do not upgrade your ubuntu when groovy repositories are turned on
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https://bugs.launchpad.net/bugs/1876046
Title:
[XPS L501X, Realtek ALC665, Speaker, Internal] "Analog Stereo" and
"Build-in speaker" appears "unplugged/unavailable"
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