Due to a recent update to GNUPG, anyone who installed Antergos prior to 12/1/2014 will need to reset their pacman keyring. It’s generally a quick and painless process. You must have an active internet connection before you perform the following commands:
NOTE: This assumes that your system is up-to-date.
sudo rm -r /etc/pacman.d/gnupg sudo pacman-key --init sudo pacman-key --populate archlinux antergos
Let us know if you have any trouble with it. Cheers!