In the https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Disks#Mounting_the_root_partition section, there seems to be an issue with the order of the commands or the efi path. Following the text order, this is the sequence of the commands provided: root #mkdir --parents /mnt/gentoo root #mkdir --parents /mnt/gentoo/efi root #mount /dev/sda3 /mnt/gentoo The mount command is going to obscure the /mnt/gentoo/efi directory that was just created.