I just tested on a clean system with:
$ apt-cache policy snapd snap-confine
snapd:
Installed: 2.17.1ubuntu1
Candidate: 2.20.1ubuntu1
Version table:
2.20.1ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
*** 2.17.1ubuntu1 100
100 /var/lib/dpkg/status
2.0.2 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
snap-confine:
Installed: 1.0.43-0ubuntu1~16.04.1
Candidate: 2.20.1ubuntu1
Version table:
2.20.1ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
*** 1.0.43-0ubuntu1~16.04.1 100
100 /var/lib/dpkg/status
and installed the latest snap in edge (r21, ie the one with xenial
libraries) and I see the snap is not using pulseaudio and instead
preferring alsa:
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file
/usr/share/alsa/alsa.conf
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM plug:default
This does not appear to be a regression in snapd 2.17 vs 2.20.1.
Downgrading the snap itself to r16 allows for sound to work with 2.17.
Downgrading/reverting the snap itself to r16 with snapd and snap-confine
2.20.1 also allows sound to work.
It appears to be something in the snap that making it not use
pulseaudio.
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https://bugs.launchpad.net/bugs/1656289
Title:
ALSA preferred instead of pulseaudio
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