gpg error #24
Description
When using sudo apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/7fa2af80.pub in installing nvidia drivers, I have an error as:
gpgkeys: no key data found for http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/7fa2af80.pub
gpg: no valid OpenPGP data found。