Comment 27 for bug 1873550

Nov 28 18:54:55 hostname systemd[1]: Started Snap Daemon.
Nov 28 18:55:06 hostname snapd[770]: main.go:155: Exiting on terminated signal.
Nov 28 18:55:06 hostname systemd[1]: Stopping Snap Daemon...
Nov 28 18:55:19 hostname snapd[770]: autorefresh.go:398: Cannot prepare auto-refresh change due to a permanent network error: persistent network error: Get https://api.snapcraft.io/api/v1/snaps/assertions/snap-declaration/xxx/xxx?max-format=4: dial tcp: lookup api.snapcraft.io: Temporary failure in name resolution
Nov 28 18:56:04 hostname snapd[770]: stateengine.go:150: state ensure error: persistent network error: Get https://api.snapcraft.io/api/v1/snaps/assertions/snap-declaration/xxx/xxx?max-format=4: dial tcp: lookup api.snapcraft.io: Temporary failure in name resolution
Nov 28 18:56:04 hostname systemd[1]: snapd.service: Succeeded.
Nov 28 18:56:04 hostname systemd[1]: Stopped Snap Daemon.

For anyone looking for a workaround:

$ sudo systemctl edit snapd.service

If empty, only add the following:

[Service]
TimeoutSec=15

I guess the value of TimeoutSec depends on how much you value the data integrity of snaps/containers that you run. I prefer not having snaps at all. I only still have it for LXD because it stopped doing apt packages. Anyway the LXC containers I run are not important, so 3 seconds is more than enough for me personally.