The Internode Mirror contains a wide selection of software for download by Internode customers.
File Download Mirror Directory Listing
Index of /pub/ubuntu-ports/dists/xenial/main/installer-arm64/20101020ubuntu451/images/netboot/ubuntu-installer/arm64/grub/
Index of /pub/ubuntu-ports/dists/xenial/main/installer-arm64/20101020ubuntu451/images/netboot/ubuntu-installer/arm64/grub/