Boot problem after update. "load kernel first"

[StonedSidney]

update command is not found!

Strange thing is, I’ve been here before:

Key xxxxx could not ne looked up remotely

Bad new I'm afraid. There were many messages like this: :: File /var/cache/pacman/pkg/librewolf-extension-plasma-integration-1.8.1-2-any.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)). Do you want to delete it? [Y/n] error: minecraft-launcher: signature from "Nico Jensch (Chaotic-AUR) <[email protected]>" is invalid :: File /var/cache/pacman/pkg/minecraft-launcher-928-1-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package ( PGP signature)). Do you wa…