Ubuntu 16.0
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Node
Node.js on Ubuntu: Moving Off 16.04 and Tuning Your Server for Performance
Ubuntu 16.04 is too old for current Node.js: official Node.js 18 and newer binaries need a newer system C library than 16.04 provides, and its standard support ended years ago. Move to a current Ubuntu LTS (a fresh server and a migration is usually safest), then tune it for Node.js with PM2 or systemd, higher open-file limits, a swap file, Nginx in front, and profiling before guessing.

