$ sudo pacman -Syyuu
error: linux54-headers: signature from "Philip Müller (Called Little) email@example.com" is invalid
:: File /var/cache/pacman/pkg/linux54-headers-5.4.6-2-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Weird enough it failed the two first tries, but succeeded the third.
You could try removing that file from the cache manually or clearing the cache next time.
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