I have been toying with Arch Linux lately, and during my initial install I was not able to get past the pacstrap -K /mnt base linux linux-firmware (the essential packages) part.
I kept getting an error that stated pacstrap error: openssl: signature from “Pierre schmitz [email protected]” is marginal trust
I was able to get around it by running the following: pacman -Sy archlinux-keyring
After the install, I ran the pacstrap again and it went through without an issue.
I am not 100% sure if this was the proper fix or not, but it seems to have worked for me. If anyone has a better fix, I would love to hear from you, please use the Contact form and let me know the proper way!