In all the reports I've seen so far, there's a cancellation during
`_get_systems` when we're in the middle of requesting info from snapd
though its API:
```python
return await self.app.snapdapi.v2.systems[label].GET()
```
However, cancelling on the client (i.e., subiquity) side does not
necessarily means the server (i.e., snapd will stop executing its query
handler). So we can't immediately expect snapd not to be using the
systems directory anymore. We'd need to wait until the request has been
responded.
```python
self._examine_systems_task = SingleInstanceTask(self._examine_systems)
```
^ this is created with `cancel_restart=True` (the default) and is probably the
reason for cancellation?
```python
self.app.hub.subscribe(
(InstallerChannels.CONFIGURED, "source"),
self._examine_systems_task.start_sync,
)
```
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https://bugs.launchpad.net/bugs/2084032
Title:
pc-kernel umount failure
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