This is my second try. Closed the first window by accident. I think with the first try it updated archlinux keyring.
Had yubikey-manager as ignored package before, because there was some issue with it. Then tried to update incl. yubikey-manager, but no luck.
Preparing...
Synchronizing package databases...
Resolving dependencies...
Checking inter-conflicts...
Warning: dependency cycle detected:
Warning: mesa will be installed before its libglvnd dependency
Warning: dependency cycle detected:
Warning: xorg-server will be installed before its libglvnd dependency
Warning: dependency cycle detected:
Warning: lib32-mesa will be installed before its lib32-libglvnd dependency
Checking keyring...
Downloading required keys...
Error: keyring is not writable
Error: keyring is not writable
Error: keyring is not writable
Error: required key missing from keyring
Failed to commit transaction
Searching around I found this: Signature is invalid. Would that be a viable solution?