I launched
sudo pacman -S grub
and after
sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id="Garuda"
and after sprezzante del pericolo e sfidando la sorte ( contemptuous of danger and tempting fate) I made a reboot.
and....
I am here. All (I hope) works fine.
Thanks,
LL