Solving Antergo's "Signature is unknown trust"

Antergos is a Linux distribution based on ArchLinux, in a similar fashion of how Ubuntu is based on Debian.

If you are using Antergos, you will have noticed errors due to wrong or unknown authentication keys when performing a full-system update, with an error message similar to "Signature is unknown trust". Luckily this is quite simple to solve.

Solution

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# pacman -S archlinux-keyring antergos-keyring
# pacman -S antergos-mirrorlist
# pacman -Syu

If you encounter any problem, please let me know.