Hello everybody. I came here because I have got exactly the same problem. The difference is that I installed from minimal image with s6. But the problem is the same.
I followed the installation step by step and I was very careful. I've read Archwiki and ArtixLinux's wiki and I cannot figure out what's going on.
This is the output from "efibootmgr -v"
sudo efibootmgr -v
BootCurrent: 0002
Timeout: 1 seconds
BootOrder: 0001,0000,0002,0003
Boot0000* ubuntu HD(1,GPT,748f8898-7d7b-44d2-b6ad-1c9e160d9bf8,0x800,0x100000)/File(\EFI\UBUNTU\SHIMX64.EFI)
Boot0001* grub HD(1,GPT,748f8898-7d7b-44d2-b6ad-1c9e160d9bf8,0x800,0x100000)/File(\EFI\grub\grubx64.efi)
Boot0002* UEFI: SanDisk PciRoot(0x0)/Pci(0x14,0x0)/USB(12,0)/CDROM(1,0x101f80,0x8000)..BO
Boot0003* UEFI: SanDisk, Partition 1 PciRoot(0x0)/Pci(0x14,0x0)/USB(12,0)/HD(1,MBR,0x0,0x101f80,0x2000)..BO
At the moment I boot from the USB but I really want to use Artixlinux with S6.
Thanks for your help.