Commandline Upgrade Ubuntu/Kubuntu Bionic 18.04 to Focal 20.04

Upgrading is simply a matter of ensuring Bionic is up to date, switching to the Focal repositories and performing and update and upgrade to Focal. e.g.

Bionic Current

Update Bionic

Change Repositories

You may have to check and change any sources you may have in /etc/apt/sources.list.d/ to point to Focal

Update and Upgrade to Focal

Welcome to Focal