Why is that? What is it trying to fix?

same as #431

The production live instance that produces https://docs.nextcloud.com/ is actually a Ubuntu 18.04
So for now I think we should not update this, so it does not get changed in a way that later on breaks production, but it was working in a random default docker on CI?

That's odd, Ubuntu 18.04 is already EOL and the current CI image is based on 20.04.

We are aware of this and will update the topic as soon as we have time for it and fixed production. Until then I would pause this here.

cc @tobiasKaminsky for sysadmin

Tracked it to update as soon as we have time.
18.0.4 LTS is still supported until end of year.

I don't know your support license but this source says April 2023.

There was an update of the base in 1cd1555 but meanwhile Bookworm was released

Production is still using Ubuntu (22.04 by now), so would be cool to keep that. 🤷