pacman-key --populate fails.
In the live environment, pacman-key --populate fails if /etc/pacman.d/mirrorlist is not exist. It would be better to run the mirror ranking script before pacman-init.service.
0001-pacman-key-populate-fails.patch
Reference link: https://github.com/phoepsilonix/manjaro-tools-livecd/commit/e9d9c1f27a51c05e4a31cddb31d9e1d61ab5dbe8