Always, always, always: Debian. It’s not even a debate. Ubuntu is a mess for using as a server with their snaps bullshit. Leave that trash on the desktop, it’s a mess on a server.
I always use Rocky Linux or Alma Linux, since I have extensive experience with enterprise Linux and RPM packages. I have Fedora on my main desktop computer. Both Rocky Linux and Alma Linux are rock-solid and are ideal for any kind of workload.
Also, Debian is a good choice if you know how to manage DEB packages and you feel comfortable with APT.
Fedora is a good choice if you want fresh packages and are willing to upgrade your server every 6 months (following the Fedora release cycle).
Rocky Linux and Alma Linux follow a similar slow release cycle of RHEL, wherein you can install your server and not have to worry for years (as long as the packages are updated with dnf update) Debian is also a slow release distribution, which makes it good for servers.
That Linux is a single OS where OS means a distro. They end up thinking that there are 3 systems in the world, Windows, Mac and Linux.
They’re pretty close, there are three types of kernels used my majority of modern computers but they since they aren’t really into different OS software they equate it with “there only 3 types of OS GUIs”.
openSUSE Leap - YaST is the greatest thing since sliced bread, and works great on command line over SSH. Yes, sometimes installing some software is difficult, but generally most stuff you would want is there and a lot of stuff runs on Docker anyway now. Very stable too, have had nearly zero issues.
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