System Updates: "unexpected error"

[Greendrake]

Use pacman to update from the cli
sudo pacman -Syu

Thanks, but.... It started asking me lots of [Y/n] questions, so I added `--noconfirm`. When that finished, there were lots of stuff like:

Code:

:: File /var/cache/pacman/pkg/....pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature))
Do you want to delete it? [Y/n]
error: failed to commit transaction (invalid or corrupted package (PGP signature))

And at the end:

Code:

Error occurred, no packages were upgraded

Now what?