A bit condescending, no? I’ve been using Kubuntu for about a decade now. Thankfully, it works well for “newbies” because it’s much easier to manage and there are a lot more packages available for it. If I want to run server packages, it handles them just fine, too. Under the hood, in terms of the kernel, they’re the same, although one might be on a newer version than the other.

Being able to run “non-free” packages is pretty important too, like if you ever want to listen to an mp3 file. Sure, most servers won’t need this. But the fact that I run my servers on Kubuntu doesn’t make them any less capable that if I were using RHEL. The REAL difference with RHEL is you get paid support, while with Debian-based distros, you’re on your own if something goes wrong.

Stable is not updated except from bug or security fixes.

Yet it’s true, that Fedora based distros (or RHEL & Centos that are the server versions) are a bit more cumbersome compared to Ubuntu, but once again – I would prefer them over Debian family..

Ok…

Well in the cloud world of 2018 Ubuntu is pretty much on spot with the increasing demands for devops.

In our enterprise we use Ubuntu servers and I can say for certain we have a better time configuring and maintaining the machines as oppose to administrators that use Linux like in the old days…

I don’t know what you are trying to prove your point to with “never using Ubuntu on servers”, Ubuntu is the best at the moment… Unless you need constant support.

As others have pointed out, su and sudo are two completely different animals and they are both used in RHEL and Debian alike.

Ubuntu is not “childish”, it just comes packaged with things that are usually not installed in a server environment. However, there is a server version of Ubuntu (Ubuntu Server) that is fantastic. If your server will stand alone, Ubuntu Server is the way to go, imho. If you are creating a clustered environment for parallel computing, Centos or RHEL are probably better choices.