Install Ubuntu on a Raspberry Pi | Ubuntu
https://ubuntu.com/download/raspberry-piThe full Ubuntu Desktop image contains everything you need to turn a Raspberry Pi into your main PC, from surfing the web and writing documents to developing software. Because of its size, it only works on the Raspberry Pi 4 models with 4GB or 8GB of RAM. 32 bit vs 64 bit The Raspberry Pi 2 only supports 32 bits, so that’s an easy choice.
Ubuntu for Raspberry Pi | Ubuntu
https://ubuntu.com/raspberry-piThe RPi Compute Module is built for production When your invention turns into a product, the Raspberry Pi compute module is a hardened, industrial grade system-on-module that provides the brain for a range of hardware from robots to racks. Take the Pi to production with Ubuntu Server LTS and Ubuntu Core with a decade of security updates.