tldr:
paru -Syu ends up with bunch of packages from different maintainers complaining about PGP signatures:
error: openscenegraph: signature from "Bruno Pagani <bruno.pagani@astrophysics.eu>" is marginal trust
:: File /var/cache/pacman/pkg/openscenegraph-3.6.5-14-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
(few sigs are marginal trust, few are unknown trust)
I tried to
pacman-key --refresh-keys, this doesnt' solve the problem & ends up with: ```gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: error retrieving 'jan.steffens@gmail.com' via WKD: No data
Also there was "via WKD: no name" in log but I can not find the exact message to copy.
This repeats for a *whole bunch* of keys.
Any suggestions?