I'm at a point where I'll be running an SPO. I am curious from the current SPOs what version of Linux do they recommend. I've practiced setting up a pool on ubuntu and mint.
The installation of Cardano nodes is done by compiling the source codes, so any Linux distribution can host your node. However, the majority of the "SPO" community is primarily experimenting with Ubuntu LTS (documentation, how-to, Q&A etc.) in the official forum. So if you're new to exploring the Cardano ecosystem, you might want to you start with the Ubuntu distrib in order to benefit from existing feedbacks.
Moreover, if you want an excellent step-by-step tutorial to set up your pool, I recommend the guide "How to build a Cardano Stake Pool" from CoinCashew.