after the upload of `snapd (2.53~pre1.git19b68f708)`, I see that snap
pre-seed optimizations aren't completing properly. the `seed-restart-
system-key` is now a call seen in `snap debug seeding`

'seed-restart-system-key': {'apparmor-features': ['caps', 'dbus',
'domain', 'file', 'mount', 'namespaces', 'network', 'network_v8',
'policy', 'ptrace', 'query', 'rlimit', 'signal'], 'apparmor-parser-
features': ['qipcrtr-socket', 'unsafe'], 'apparmor-parser-mtime':
1628490219, 'build-id': '62fa24aa378519ac08950d814427f03cc6ef1ee5',
'cgroup-version': '2', 'nfs-home': False, 'overlay-root': '', 'seccomp-
compiler-version': '59f5ac9a4838ef078f5b3f464f7669f76fddeab0 2.5.1
80ce90419d281437e5b8b03baec604016043649f7c00b7a578f5fc8afef1d29c bpf-
actlog', 'seccomp-features': ['allow', 'errno', 'kill_process',
'kill_thread', 'log', 'trace', 'trap', 'user_notif'], 'version': 10}

the helpful message in our tests state:

```
snap debug seeding' output (on stdout) contained
'seed-restart-system-key'.  This indicates a kernel feature mismatch between
the running kernel and the feature set hard-coded in livecd-rootfs
for this image.  Boot will be slowed by ~200ms until this is resolved
in livecd-rootfs.

Check the debug logs for /sys/kernel/apparmor/features/* and
/proc/sys/kernel/seccomp/actions_avail to update livecd-rootfs.

This failure can be ignored when publishing images with critical fixes.
```

I know the upload changed some seccomp profiles, so it may be that
something has changed in a way that's incompatible with livecd-rootfs.

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https://bugs.launchpad.net/bugs/1944004

Title:
  snapd.seeded.service never finishes on non-amd64

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