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Docker as a factory: fixing broken GPU software without touching the OS

January 2026 — when a friend’s astrophotography software broke and the internet said “reinstall Ubuntu” A friend of mine called me with a problem. She had a new machine with an RTX 5060 Ti, PixInsight installed natively, and BlurXTerminator — a GPU-accelerated AI denoising plugin for astrophotography — completely broken.