Why would anyone use Ubuntu on a server? Ubuntu is basically Debian unstable + non-free drivers that they tried to get sorta stable in 6 months. That may be ok on a desktop where you can accept some bugs in exchange for newer versions of the software. But why would you not run Debian stable on a server instead?

Maybe 10 years ago when Debian stable got really out-of-date, but that hasn’t been true in a looong time. Debian releases much more frequently, much stabler, it has all the goid stuff from Ubuntu backported but none if the bad stuff.