I think Christian's feeling is right.

SRU policy is to cherry-pick specific fixes. Normally we'd expect a bug
report to have identified a root cause in the code, and we'd be patching
that root cause to fix the problem.

Identifying that one version works and one version does not, and
therefore we should swap the version in a stable release, doesn't comply
with this requirement and isn't normally acceptable because there
usually exist users not affected by the bug who might find that
behaviour for them changes, contrary to their expectations of a stable
release. It's also incomplete to just identify version differences like
this: there is always going to be a root cause in the code, so it should
always be possible to turn this case into the first case above and
therefore to find a way to update the package with which we can be more
confident doesn't disrupt existing unaffected users.

Exceptionally, if we can be certain that there aren't any existing
unaffected users, then we can bump the version safely. Or if it's not
practical to do the above step, we might decide that the "least worst"
solution is to take that risk. But then I'd expect the case to be made
that there are no existing unaffected users and therefore there can be
no disruption by the version bump. Or an explanation of why it is not
practical to turn this into the first case and risking regression to
existing users is "least worst".

Christian said:

> But as we've seen it seems there are (basic?) configurations which
were fine before, therefore I'm not entirely sure we can really push
this as an SRU :-/

That does sound to me like a cherry-pick is required here, unless a case
is made for the exceptions I outlined above.

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https://bugs.launchpad.net/bugs/1874831

Title:
  libnginx-mod-nchan distributes old/incompatible module

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