Build a Ubuntu machine meant to run Plex and some emulators for retro controller type games. I also use it to watch movies with my friend who lives in the UK and we use SyncPlay while torrenting movies. I basically had to make sure all my Windows programs worked in Ubuntu but pretty happy how it managed to turn out. I since installed Ubuntu on my main desktop since it's so slick with the 18.04 update
I mostly cared about how cheap the build was and it had to use some spare parts I had laying around (like the CPU cooler came from my main build but I have since upgraded that to something bigger as well as but it in a new case). The RAM is only 8GB but I couldn't find it so I picked the next best thing. It was a super easy install and powered up ASAP and Ubuntu was installed without issue. Uses integrated graphics (the case doesn't have a spot for a GPU anyways) and overall pretty pleased with how fast it is since it's one of Intel's cheaper CPU's (Pentium Gold).
I used a spare 750 EVO for the SSD, it's only 120GB and then I have a 2TB external drive that I threw in an enclosure I had lying around. The build cost me $350 in new parts this 2018 Black Friday.
Still working on getting Plex to see my library of torrented garbage movies. My Dad has a huge collection of BluRays I plan to rip and throw into a NAS at some point, but for now that's for next year's Black Friday.
I like that my TV has built in Chromecast, so I can keep the MediaPC active on HDMI and then cast and it'll take over the screen.