Translations:GRUB/Restore the GRUB Bootloader/14/en
Verify the existance of an EFI system partition
root # lsblk -o PATH,PTTYPE,PARTTYPE,FSTYPE,PARTTYPENAME
Verify the efi filesystem is loaded
root # ls /sys/firmware/efi
Exit chroot
root # exit
Try loading the efi filesystem
root # modprobe efivarfs
Re-enter chroot
root # manjaro-chroot /mnt /bin/bash
Then mount the efi filesystem
root # mount -t efivarfs efivarfs /sys/firmware/efi/efivars
Verify the efi filesystem is loaded
root # ls /sys/firmware/efi
If successfull re-run above installation commands