Finally I followed this post,
https://unix.stackexchange.com/questions/518432/manjaro-update-fails-signature-is-unknown-trust
but I am not sure if changing “SigLevel = Never” in “/etc/pacman.conf” is smart. At least the upgrade worked, but can I trust it? Can someone give me a clue?
That solution is literally the same one as the solution from this thread: Maintainer pgp keys expired - #43 by tomterl
Of course, without the totally insecure allowing of all signatures. Theoretically, all your packages could now be compromised because your mirror (or any malicious actor in-between) could send you modified packages without you noticing because you allowed all signatures.
OK, thanks! I see, that was rather dumb…
Can I resume somehow safely, without re-installing from scratch?
Yes!
No one else can answer that question for you as we don’t know your technical expertise, so:
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