I own a mid 2009 Macbook 5.2 with upgraded RAM of 6GB and an upgraded hard drive of 1TB. I was originally interested in triple booting it, however, I already have it double booted with High Sierra and I just added Windows 8.1 Pro, and I don't feel like I wanna do that again right now. (Not that it's hard to do or that I don't enjoy an extraneous project- it may end up being what I gotta do.) Would I be able to keep my windows partition if I replaced my MacOS with Ubuntu? Would everything function OK? I have my old hard drive that contains all my old MacOs stuff, so if I decided I wanted to go back to Mac it wouldn't be a problem. I usually do a clean install using dosdude1's High Sierra patch anyway.