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valheim-server-docker
Valheim dedicated gameserver with automatic update, World backup, BepInEx and ValheimPlus mod support
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
FWIW, I'd recommend running the Valheim Server in Docker (https://github.com/lloesche/valheim-server-docker) if you're somewhat unfamiliar with Ubuntu/Linux. While you may have to get to grips with the basics of Docker, it's much simpler than getting wrapped up in library dependencies and other Linux rabbit-holes. It's also much simpler updating and managing the server. As for getting the existing world onto the dedicated server, FTP is an option. The simpler option, which doesn't involve setting up an FTP server) is to use WinSCP or PuTTY and "scp" the files over. "scp" just runs over SSH, which is already up and running on your Ubuntu server.