Chromium is an open-source web browser developed by Google.
Google also develops a proprietary browser based on Chromium called Chrome. This is the browser Google promotes and provides repositories for. There are no Google repositories for Chromium.
Chromium can be installed from the official repositories.
Linux Mint 18.x and 19.x¶
In Linux Mint 18.x and Linux Mint 19.x the packages is called chromium-browser:
apt install chromium-browser
Linux Mint 20.x and LMDE 4¶
In Linux Mint 20.x and LMDE 4, it is called chromium:
apt install chromium