This is the cloud-init file that can be used in the 20.10 raspi image

The image was originally mounted using

    mkdir mnt
    sudo mount -o loop,offset=1048576 ubuntu-20.10-preinstalled-server-arm64+raspi.img mnt

Then copy `mnt/user-data` with the contents from this snippet, i.e.

    cp user-data.yaml mnt/user-data

Unmount the folder

    umount mnt

Now write to the sdcard, in my example below `/dev/sda` is the sdcard

    sudo dd if=ubuntu-20.10-preinstalled-server-arm64+raspi.img of=/dev/sda bs=4M conv=fsync