Jetson Orin Nano Developmen Kit - NVMe flash fails in every possible way

sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1 -c ./tools/kernel_flash/flash_l4t_nvme.xml -S 200GiB --showlogs --erase-all jetson-orin-nano-devkit nvme0n1p1

Fails in the same manner I have seen in SDKM, citing permissions issues with RTELink. Why is this so broken on Ubuntu 20? It seems Ubuntu 18 works fine: