Comment 5 for bug 1817391

Your system has a modified config file here:

https://launchpadlibrarian.net/412444169/modified.conffile..etc.modprobe.d.alsa-base.conf.txt

--- /etc/modprobe.d/alsa-base.conf 2015-07-31 11:42:17.000000000 +0800
+++ Downloads/modified.conffile..etc.modprobe.d.alsa-base.conf.txt 2019-02-27 10:26:15.241596972 +0800
@@ -41,3 +41,4 @@
 options snd-pcsp index=-2
 # Keep snd-usb-audio from beeing loaded as first soundcard
 options snd-usb-audio index=-2
+options snd-hda-intel position_fix=2

but I don't know if that's relevant to this bug. In case it is then please try commenting out the line:

  options snd-hda-intel position_fix=2

by changing it to:

  #options snd-hda-intel position_fix=2

and reboot.

As for testing other flavours, that's not the same as testing other versions. Please follow the links in comment #3, boot each of the live sessions and tell us if they exhibit the same bug.