Regression error: apt-get update - '...ubuntu2004/x86_64 Release' does not have a Release file

Same as Error apt-get updating from nvidia/cuda11.2.1-base-ubuntu20.04 - CUDA / CUDA Setup and Installation - NVIDIA Developer Forums

Cannot install because I keep getting this error:
Reading package lists…
E: The repository ‘Index of /compute/cuda/repos/ubuntu2004/x86_64 Release’ does not have a Release file.

When I open the path manually, the Release file is there. The problem must be that ’ Release’ is regarded as part of the path. It was fixed in the past, so it’s like an error on your side.
Thanks for fixing it quickly!

When I turned off Cloudflare Warp Client, it worked…

Oops. But maybe this can be helpful for someone with equally shallow knowledge of the matter…
Have a nice day, everyone!