v11.51 pinned 580.126.20 (DGX OS 7.5.0's validated combo), but
build-nvidia-module.sh downloads the .run installer from
download.nvidia.com/XFree86/Linux-x86_64/<version>/, a separate catalog
from the CUDA apt repo checked previously. 580.126.20 404s there —
same failure class as the original 550.54.15 CDN-404 incident.
Checked all 580.x point releases on that CDN; only some are mirrored
(580.126.09, 580.159.03/.04, 580.173.02 are 200; 580.126.16, 580.126.20,
580.167.08 are 404). Switched to 580.159.03: confirmed downloadable,
confirmed present as .deb in the apt repo, and it's the exact driver
version running on the real DGX Spark.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Mikhail Chusavitin
fb581c28d8