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sanboot makes the ISO visible to UEFI but invisible to the Linux kernel after ExitBootServices(). Switch to direct kernel/initrd boot with a small CPIO overlay containing /pxe-init — a shell script that loads NIC drivers, configures DHCP, downloads the ISO via wget, and creates a loop device before handing off to the Proxmox installer init. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>