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Download the Ubuntu preinstalled server image
This image is bootable and can be flashed to SD cards for the Pi
sudo losetup -Pf --show ubuntu-image.img
lsblk
sudo mount /dev/loop0p1 /mnt/image
sudo umount /mnt/image sudo losetup -d /dev/loop0
diskutil list diskutil unmountDisk /dev/disk sudo dd if=/path/to/your/image-file.img of=/dev/rdisk2 bs=1m status=progress