Ubuntu Headless

ubuntu-headless.sh

# Unmount mounted microSD card partitions, just in case
sudo umount /dev/mmcblk0p1
sudo umount /dev/mmcblk0p2

# Download the latest Ubuntu Server and upload it to microSD card: https://ubuntu.com/download/raspberry-pi
wget http://cdimage.ubuntu.com/releases/19.10.1/release/ubuntu-19.10.1-preinstalled-server-arm64+raspi3.img.xz
xzcat ubuntu-19.10.1-preinstalled-server-arm64+raspi3.img.xz | sudo dd of=/dev/mmcblk0 bs=4M conv=fsync status=progress
sync

sudo partprobe /dev/mmcblk0
sudo mkdir /tmp/rpi
sudo mount /dev/mmcblk0p1 /tmp/rpi
# Configure static IPs: https://netplan.io/examples#using-dhcp-and-static-addressing and https://ubuntu.com/tutorials/how-to-install-ubuntu-on-your-raspberry-pi#3-wifi-or-ethernet
sudo tee /tmp/rpi/network-config > /dev/null <<'EOF'
version: 2
ethernets:
  eth0:
#    dhcp4: true
    addresses: [192.168.1.254/24]
    gateway4: 192.168.1.1
    nameservers:
      addresses: [9.9.9.9]
    optional: true
wifis:
  wlan0:
#    dhcp4: true
    addresses: [192.168.1.253/24]
    gateway4: 192.168.1.1
    nameservers:
      addresses: [9.9.9.9]
    optional: true
    access-points:
      YOUR_WIFI_NAME:
        password: "YOUR_WIFI_PASSWORD"
EOF
sudo umount /tmp/rpi
sudo rm -rf /tmp/rpi

# Boot RPi from microSD card
ssh ubuntu@192.168.1.254
#ubuntu

# OS update
sudo apt update
sudo apt full-upgrade

# Reboot to apply the changes
sudo reboot