Nvidia DGX-2 - A.3 Creating a Local Mirror of the NVIDIA and Canonical Repositories; A.3.1 Create the Mirror in a DGX OS 4 System

b) Download the image ISO file.
Restoring the DGX-2 Software Image
https://docs.nvidia.com/dgx/dgx-os-server-release-notes/index.html#dgx-os-release-
number-scheme
https://docs.nvidia.com/dgx/pdf/DGX-OS-server-4.1-relnotes-update-guide.pdf
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Note: These procedures apply only to upgrades within the same major
release, such as 4.x → 4.y. It does not support upgrades across major
releases, such as 3.x → 4.x..
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/media/usb/repository
apt-mirror
$ sudo apt update
$ sudo apt install apt-mirror