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35a32c5
(Get the code!)
So the problem with declaring the package as failed if the DKMS build failed is that it may actually pass or fail depending on how far along into the updates you are.
Say you are updating to a new linux-headers with a new ABI at the same time as installing the NVIDIA package.
Well if the NVIDIA package is processed first, the headers aren't yet installed, so the package will fail during postinst, but as soon as the headers are loaded, the kernel postinst runs and the modules get successfully built.