Install Ubuntu Server 20.04.1 LTS 64-bit on Raspberry Pi

I was trying to get Ubuntu Server 20.04.1 LTS Focal Fossa installed on a Raspberry Pi 3 B+. While this seems like it should have been a straightforward endeavor, it was rife with trial and error, and hence frustration.

Here’s what finally worked for me.

1. Download and install the Raspberry Pi Imager tool
2. Visit the Releases page for Ubuntu 20.04
3. Download the ubuntu-20.04.1-preinstalled-server-arm64+raspi.img.xz file
4. Use the Raspberry Pi Imager tool to flash this file to your microSD card

I connected my Raspberry Pi with an RJ-45 cable to the physical network, and plugged in a monitor and keyboard, due to the issues I was having.

1. Login with default username / password of ubuntu / ubuntu
2. IMPORTANT: Run sudo apt update && sudo apt upgrade --yes
3. Edit the /etc/netplan/50-cloud-init.yml file
4. Add your wifi configuration to the file
5. Run sudo netplan apply --debug

This got me up and running, however I still have a problem where I am unable to connect to a 5Ghz wifi network. Instead, I had to connect to my 2.4Ghz wifi SSID for the time being. Keep an eye on this bug report for more information about the wifi issues.