Hi,
If you don’t need Ubuntu desktop in the use-case, you may use minimal flavor rootfs(or basic flavor) and enable rc.local:
Jetson AGX Orin FAQ
Q: How to autorun an app or commands at startup?
To launch DRM or X11. For launching DRM, please run
$ sudo modprobe nvidia-drm modeset=1
To launch simple X window, you may run
$ xinit &