Notes for configuring Ubuntu 20.04.1 LTS on Raspberry Pi.

I currently use a customized Ubuntu image that includes the following modifications:

• Disabled resizing of partitions and filesystems to use entire SD card on first boot in cloud-init
• Disabled automatic patching of Ubuntu on first boot via cloud-init
• Add users, SSH keys, and sudo configuration for Ansible

On first boot you can find the Pi on the network from a DHCP server (or any other host that has an ARP cache for the subnet including this host) using the following:

#!/bin/bash
echo "The following Raspberry Pi 4 devices have been found:"
arp -a | grep dc:a6
# add MAC for other models...

After logging in you should reconfigure the filesystem and disable cloud-init to ensure that it does not automatically modify the filesytem or partitions in future updates.

# disable
touch /etc/cloud/cloud-init.disabled

# manually modify the partition table and grow the filesystem
parted /dev/mmcblk0
resizepart # configure partition 2 as desired
quit
resize2fs /dev/mmcblk0p2

# optional: remove cloud-init completely
apt-get purge cloud-init
rm -rf /var/lib/cloud/*
# if you do not remove cloud-init be sure not to allow your
# configuration to be overwritten in future updates to the package

Next do the following:

• set hostname
• install python for Ansible
• configure network /etc/netplan/99-config.yaml
• run ubuntu_ansible_control.yml playbook to update profile recent profile

Add the following to Ansible plays in the future:

• disable ipv6
• timezone
• default editor
• prune packages
• sshd config
• disable ubuntu account or remove
• configre motd

Quick reference for Raspberry Pi hardware tools on Ubuntu.

See also: Raspberry Pi

• Ubuntu Wiki: ARM/RaspberryPi
• RPiconfig
• Ubuntu Raspberry Pi Downloads