Install Ubuntu on a Raspberry Pi | Ubuntu
https://ubuntu.com/download/raspberry-piThe Raspberry Pi 2 only supports 32 bits, so that's an easy choice. However the Raspberry Pi 3 and 4 are 64 bit boards. According to the Raspberry Pi foundation, there are limited benefits to using the 64 bit version for the Pi 3 due to the fact that it only supports 1GB of memory; however, with the Pi 4, the 64 bit version should be faster.
Raspberry Pi Documentation - Using Linux
www.raspberrypi.com › documentation › linuxThis is the 'package manager' that is included with any Debian-based Linux distributions, including Raspberry Pi OS. It allows you to install and manage new software packages on your Raspberry Pi. In order to install a new package, you would type sudo apt install <package-name> , where <package-name> is the package that you want to install.
Install Ubuntu on a Raspberry Pi | Ubuntu
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.