Fix invalid PGP signature on Arch Linux install

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Recently I had an issue when I was trying to install Arch Linux onto a server, where pacman would refuse to finish due to a package named libcap being "corrupted". The exact error was:

error: libcap: signature from “David Runge [email protected]” is marginal trust

File /var/cache/pacman/pkg/libcap-2.65-1-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).

Fortunately, the fix was really easy, all you have to do is this:

  • Go into the terminal and type the following commands:
    • pacman -Syy
    • pacman -S archlinux-keyring

Then run pacman again. Afterwards, the error will be fixed!