I have just started my old PC after several months without using and updating it. As it happens, I am unable to update the system. The reason for that initially seemed to be that the “Antergos Builder” key was of unknown trust.
I have tried to re-install all the keys by following the steps explained in this thread. Although all steps go without any problem, updating the system remains impossible.
I have even tried to get a fresh start by erasing the gnupg file
rm -rf /etc/pacman.d/gnupg pacman-key --init
but the result is the same: all keys are of unknown trust and updating remains impossible.
Any suggestion? Thanks in advance for your help!