I want to install Chromium from the Linux Mint repositories in Ubuntu 20.04, to avoid snap.
This answer describes how to install Chromium from the Debian repository.
However, the Linux Mint repository usually hosts an updated version of Chromium compared to Debian (as of 12th January 2022, LM 20 repository contains Chromium 97, whereas Debian 11 repository has Chromium 90), and also, Debian security team might soon discontinue maintaining Chromium.