(1) I am unclear how you are trying to install antiX. Are you booting from a live usb and then running the installer?
(2) Are you sure your bios is the newer UEFI type and NOT the old BIOS type? (GPT partitions can be used with either.)
(1) I am unclear how you are trying to install antiX. Are you booting from a live usb and then running the installer?
(2) Are you sure your bios is the newer UEFI type and NOT the old BIOS type? (GPT partitions can be used with either.)