I remember when Canonical released Xenial Xerus five years ago. Among its novelties, one of the ones that most caught my attention was what they called Snap packages. Mark Shuttleworth and company promised they would be the best, and five years later I hardly install one or two on any of my Linux machines because I prefer the official repository software or the Flatpak ones. But that is part of the past, since for a few days, on April 29, Ubuntu 16.04 Xenial Xerus has reached the end of its life cycle.
Personally, and this is my opinion, I can’t quite understand why someone would want to stay five years in a version of an operating system, and less in one like this than used Unity how little I like it. I do understand in part that companies do it, or that some prefer to stay only two years in the LTS versions, which is what they exist for, but the important thing here is that Canonical no longer supports Xenial Xerus users.
Ubuntu 16.04 enters ESM phase for enterprises
Reflection aside, there are now two different scenarios: As mentioned, Canonical stops supporting normal users, but Ubuntu 16.04 now go on to use the acronym ESM for businesses, that means extended support maintenance. In other words, Xenial Xerus will no longer update any more packages, unless it is used in a company and support is activated, in which case it will continue to receive security updates until 2024, as explained here.
Now the question for some will be whether to upgrade to Ubuntu 18.04 or Ubuntu 20.04. My advice is to make the leap to Focal Fosa, since it has already been available for a year, it has four support left and both the version released in April 2018 and the one released two years later use GNOME, and Canonical is known to performance has been improving version after version. Whatever you choose, you have to update now.