Can you post your grub-install command and the content of your boot partition please ? That's would be awesome :mrgreen: I have abandoned the idea of putting Ubuntu 64bit directly on Raspberry pi, so I don't have those files on any of my SD card now. Since your install media can boot into u-boot wi...

If you follow the guide of https://wiki.ubuntu.com/ARM/RaspberryPi#Booting_generic_arm64_ISO_images , I guess you are able to manually boot into Ubuntu Server, but get stuck when running: sudo grub-install --no-nvram From my experience, I got this error "grub-install: error: cannot find EFI director...