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The NVIDIA CUDA HTTPS apt source (developer.download.nvidia.com) may be unreachable from inside the live-build container chroot, causing 'E: Unable to locate package datacenter-gpu-manager-4-cuda13'. Add build-dcgm.sh that downloads DCGM and nvidia-fabricmanager .deb packages on the build host (verifying SHA256 against Packages.gz) and caches them in BEE_CACHE_DIR. build.sh (step 25-dcgm, nvidia only) copies them into LB_DIR/config/packages.chroot/ before lb build, so live-build creates a local apt repo from them. The chroot installs the packages from the local repo without ever contacting the NVIDIA CUDA HTTPS source. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>