Which OS you should put on your first server

By Raviteja KNTSUpdated July 9, 2026

The safe pick for almost everyone starting out is boring on purpose: a plain Linux, Ubuntu Server or Debian, with Docker on top. It runs every app in this guide, and when something breaks, someone has already hit the same wall and written down the fix.

That last part is the real reason. Nearly every tutorial assumes Ubuntu or Debian, so when you paste an error into a search box at 11pm, the answer is already there. Pick something clever and unusual and you're on your own, debugging the platform on top of the actual problem. (I run Debian myself; Ubuntu Server is the more common pick in guides. Either is safe.)

The other options aren't wrong. They trade some control for a friendlier setup or stronger storage, and the trap is reaching for one before you've run a single app. Here's the landscape:

Ubuntu Server or Debian, plus Docker: the default, and what this guide uses. Fixes are easy to find because everyone runs it. Start here.
CasaOS and similar dashboards: a friendly web UI that installs apps for you. Fine to use, but it hides what's happening, so you learn less and can get stuck inside it when an app misbehaves.
TrueNAS or Unraid: built around storing and protecting files across several drives, with apps as a bonus. A strong choice if storage is your main goal.
Proxmox: splits one machine into several virtual servers. Genuinely useful later, but a thick extra layer to learn on day one. Skip it for now.

Plenty of people end up with both eventually, a plain box for apps and a NAS for storage, and that's a fine place to land. Two quick notes whichever you choose: pick the LTS or stable release so you're not reinstalling every few months for security updates, and don't install a full desktop on a server you'll never plug a monitor into, it just eats memory your apps could use.

Start with Debian or Ubuntu Server, then add Docker for apps.

So: Ubuntu Server or Debian, plus Docker. Deciding is the easy part. Next you actually put it on the machine and get it online, the step most guides skip and where beginners get stranded. Let's install the OS and get the server online.