apt-update in Azure Nvidia gives publickey error-CodePudding

I started a NVIDIA VM on AZURE and trying to do update using sudo apt update but gives error:

Hit:2 http://azure.archive.ubuntu.com/ubuntu focal InRelease                                                 
Hit:3 http://azure.archive.ubuntu.com/ubuntu focal-updates InRelease                                         
Hit:4 http://azure.archive.ubuntu.com/ubuntu focal-backports InRelease                                   
Hit:5 https://packages.microsoft.com/repos/azure-cli focal InRelease        
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease            
Err:1 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
Reading package lists... Done
W: GPG error: http://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
E: The repository 'http://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

to install the keys i used sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv A4B469963BF863CC

but that gives No data error. gpg: keyserver receive failed: No data

I can run sudo apt-get upgrade but not the update. Any help would be appreciated

Even though there is cuda installed but it still doesnt find cuda libraries, and that could be due to update.

CodePudding user response：

I found the solution. This error was occuring due to NVidia GPG key rotation occurred today. All the details are provdhttps://developer.nvidia.com/blog/updating-the-cuda-linux-gpg-repository-key/

CodePudding user response：

the following worked for me

apt-key del 7fa2af80
rm /etc/apt/sources.list.d/cuda.list
rm /etc/apt/sources.list.d/nvidia-ml.list
wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/cuda-keyring_1.0-1_all.deb
dpkg -i cuda-keyring_1.0-1_all.deb

I ran those commands in docker container, so in VM you might need to add sudo.