$ sudo pacman-key --recv-keys B728DB23B92CB01B && sudo pacman-key --lsign-key B728DB23B92CB01B
gpg: key B728DB23B92CB01B: "Mesa Freeworld <info@manjaro.download>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
-> Locally signed 1 keys.
==> Updating trust database...
gpg: next trustdb check due at 2023-10-27
$ sudo pacman -Sy
[sudo] password for sergio:
error: mesa-nonfree: signature from "Mesa Freeworld <info@manjaro.download>" is invalid
:: Synchronizing package databases...
error: failed to synchronize all databases (no servers configured for repository)
Moderator edit: In the future, please use proper formatting: [HowTo] Post command output and file content as formatted text