There are very simple instructions for installing Ubuntu on a Raspberry Pi, simply downloading the Imager and then pick the OS (which it will download for you, I used Ubuntu Server 20.04 LTS), and write it to the micro SD card for your Pi. https://ubuntu.com/tutorials/how-to-install-ubuntu-on-your-raspberry-pi
The image is pre-configured for DHCPv4 using the wired Ethernet connection, with alternative instructions for getting it setup with Wi-Fi, but without mention of IPv6, which is now used by 30-35% of the Internet.
Here are instructions for setting up Ubuntu on your Raspberry Pi up with IPv6 only.
Continue reading Ubuntu, Raspberry Pi, IPv6 only(6 min read)