Since archinstall is included on the default archlinux installation media, it would be common for arch uses to keep an old usb drive with arch installation media on hand for emergency recovery. Also with tools like ventoy it is more popular to keep a usb drive full of isos as a toolkit.

As these Arch isos age, the keyrings they come with expire leading to failures to install packages in the middle of the archinstall script - after destructive steps like disk partitioning and filesystem creation have been completed. The simplest solution is to reboot into the arch install media, runpacman -S archlinux-keyring, then run archinstall, but new users might not know this and the user might not have access to a secondary device to easily look up commands.

Archinstall could prevent this problem by refreshing the archlinux-keyring early in the script, or at least to offer the option to refresh the keyring before a point of no return.