Public bug reported:
Since the update from snapd 2.17.1ubuntu1 to snapd 2.20.1ubuntu1 that
landed in xenial-updates on 2017-01-05, a (private) snap I use that
speaks to the soundcard no longer can do so. I now get errors of the
type:
ALSA lib conf.c:3759:(snd_config_update_r) Cannot access file
/usr/share/alsa/alsa.conf
I see that there is an alsa slot now, but my snap (provided by a third
party) does not provide an alsa plug, so there appears to be no
workaround.
I understand why you'd want to add an alsa slot and disable access to
ALSA by default in an update. I'm not against this in principle, but if
this change is to land in Xenial automatically, it seems to me that
there needs to be a migration path and mention in the changelog. The
changelog does say "interfaces: add alsa" but makes no mention of the
ensuing expected breakage.
Downgrading just the snapd package to 2.17.1ubuntu1 works around the
problem.
** Affects: snapd (Ubuntu)
Importance: Undecided
Status: New
** Tags: regression-update
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https://bugs.launchpad.net/bugs/1656289
Title:
[Regression] 2.20.1ubuntu1 breaks snaps that use ALSA
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