I have the same issue:

nov. 06 22:38:00 MASKED audit[1430]: USER_AVC pid=1430 uid=103 auid=4294967295 
ses=4294967295 msg='apparmor="DENIED" operation="dbus_method_call"  
bus="system" path="/" interface="org.freedesktop.DBus.ObjectManager" 
member="GetManagedObjects" mask="send" name="org.bluez" pid=4265 
label="snap.chromium.chromium"
nov. 06 22:38:00 MASKED kernel: audit: type=1107 audit(1573076280.807:71): 
pid=1430 uid=103 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" 
operation="dbus_method_call"  bus="system" path="/" 
interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" 
mask="send" name="org.bluez" pid=4265 label="snap.chromium.chromium"

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Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1850912

Title:
  ALSA audio not working any more (with snap package)

Status in chromium-browser package in Ubuntu:
  Incomplete

Bug description:
  After upgrading from Ubuntu 19.04 to Ubuntu 19.10, audio in chromium
  browser stopped working, presumably this is related to chromium now
  being a snap package:

  Description:  Ubuntu 19.10
  Release:      19.10

  Package: chromium-browser
  Architecture: amd64
  Version: 77.0.3865.120-0ubuntu1~snap1

  Note that I don't use pulseaudio or any other audio server on my
  system, it's supposed to use ALSA directly. In .xsession-errors I see:

  ALSA lib conf.c:3916:(snd_config_update_r) Cannot access file 
/usr/share/alsa/alsa.conf
  ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default
  [2536:2536:1031/194827.989956:ERROR:alsa_util.cc(204)] PcmOpen: default,No 
such file or directory
  ALSA lib conf.c:3916:(snd_config_update_r) Cannot access file 
/usr/share/alsa/alsa.conf
  ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM plug:default
  [2536:2536:1031/194827.990132:ERROR:alsa_util.cc(204)] PcmOpen: 
plug:default,No such file or directory

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