Recommended versions of Ubuntu and UniFi Controller for AWS

For AWS UniFi Controller, What version of Ubuntu amd what version of the controller are recommended at this time? I just got an e-mail from AWS that Ubuntu 16.04 is on LTS and I need to upgrade.

Move to 20.04 LTS as it is the latest long term release version.

I’m having trouble keeping my controller up and running, so I think it’s time for an upgrade.
What are the recommended versions of Linux and UniFi today for my AWS EC2 controller?