Apt-Get not working on Ubuntu 18.04

After running apt-get update on Ubuntu 18.04, I get the following error:

E: Failed to fetch https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/by-hash/SHA256/89b0936b235e12809e017b7f284bd5ddb6ed2c1ab16c0054186e73283d6a98d3 404 Not Found

I confirmed that this URL is indeed broken (both http: and https: yield a 404 error), and that the SHA256 hash is the one listed in https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/Release

Has been broken for a few days now - any guidance would be appreciated!