I mean probably if I had to guess based on very old information when they went to linux my guess is it was debian. Everything live for poal is ubuntu(don't judge me) I have several different OSs on the lab for test instances and nothing gets pushed until its hit at least 2 test environments with empty and populated DBs

Edit: Unless I'm setting up a new sub domain then all bets are off.

He's probably a cat. He poops in that sandbox.