Linux Mint 19 was based on Ubuntu 18.04 LTS and Mint 20 is based on Ubuntu 20.04 LTS — so you will find a lot of things different, improved, and potentially better.
There’s a lot of things to talk about when it comes to Linux Mint 20 release. While we have already covered the new key features in Linux Mint 20, I’ll mention a few points here for a quick glance:
It’s FOSS has a detailed guide showing the steps to upgrade Linux Mint version from 18.3 to 19. However, the upgrade from 19.3 to 20 will be available in next few days. It’s FOSS team will be doing some tests for Mint 19.3 to Mint 20 upgrade and update this guide as applicable.
You can simply head on to its official download page and grab the latest stable ISO for yourself. You’ll find the ISO for the officially supported desktop environments, i.e. Cinnamon, MATE and Xfce.
If you just want to try it out without replacing your main system, I suggest installing Linux Mint 20 in VirtualBox first and see if this is something you would like.