Chromium is the open source base for Google’s Chrome browser which dominates the browser market. It is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web.
To install Chromium browser on Kubuntu 20.04 open Konsole and type,
sudo apt install chromium-browser
Enter your password and answer any questions and Chromium will install. Afterwards you can find Chromium in the Applications Menu by searching or under Applications/Internet.