Did you manage to solve this. I have the same issue now.
Before it was working on my 5.4 kernel (Ubuntu 20.04), but then I
installed the 5.8 kernel to test something, and purged nvidia.
Now when I return to 5.4 kernel and want to switch to the same nvidia
that was working ("Using nvidia driver metapackage from nvidia-
driver-440 (proprietary, tested)") I get the error as in the attachment.
** Attachment added: "c2d81c46-3625-490a-8e39-4c345c642d96"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-440/+bug/1878946/+attachment/5405426/+files/c2d81c46-3625-490a-8e39-4c345c642d96
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https://bugs.launchpad.net/bugs/1878946
Title:
Cannot install proprietary NVIDIA driver
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