What are the specifications of the Plex Linux server

Plex Media Server
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Want to make a new server for high conductors quality 1080p with 4k PC Linux Ubuntu I want to know what are the specifications of the required device as server works with plex is it Linux or there is something better

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My ubuntu 18.04 and 20.04 machines have run better than my win10 machines with plex. YMMV. They run leaner, lower resource usage.