other report in the wild: https://askubuntu.com/questions/1085176/sound-
device-lost-after-update-to-18-10
note that their debugging steps don't even work for me, running pacmd
just gets a complaint that the pulse daemon isn't running, even though
it looks like systemd intentionally started it in non-daemon mode:
```
$ pacmd list-cards
No PulseAudio daemon running, or not running as session daemon.
$ pstree
[...]
|-systemd-+-(sd-pam)
| |-at-spi-bus-laun-+-dbus-daemon
| | `-3*[{at-spi-bus-laun}]
| |-dbus-daemon
| |-dconf-service---2*[{dconf-service}]
| |-evolution-addre---5*[{evolution-addre}]
| |-evolution-calen---9*[{evolution-calen}]
| |-evolution-sourc---3*[{evolution-sourc}]
| |-gnome-screensav---3*[{gnome-screensav}]
| |-gnome-shell-cal---5*[{gnome-shell-cal}]
| |-goa-daemon---3*[{goa-daemon}]
| |-goa-identity-se---3*[{goa-identity-se}]
| |-gvfs-afc-volume---3*[{gvfs-afc-volume}]
| |-gvfs-goa-volume---2*[{gvfs-goa-volume}]
| |-gvfs-gphoto2-vo---2*[{gvfs-gphoto2-vo}]
| |-gvfs-mtp-volume---2*[{gvfs-mtp-volume}]
| |-gvfs-udisks2-vo---2*[{gvfs-udisks2-vo}]
| |-gvfsd-+-gvfsd-trash---2*[{gvfsd-trash}]
| | `-2*[{gvfsd}]
| |-gvfsd-fuse---5*[{gvfsd-fuse}]
| |-gvfsd-metadata---2*[{gvfsd-metadata}]
| |-pulseaudio---{pulseaudio}
[...]
```
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https://bugs.launchpad.net/bugs/1799007
Title:
no sound after 18.10 upgrade
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