CUDA 10.1 Install GPG error: The following signatures were invalid: BADSIG F60F4B3D7FA2AF80

I’m trying to install CUDA-10.1 from the NVIDIA compute/cuda repository for ppc64el, and I’m getting the following error:

W: GPG error: https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/ppc64el  Release: The following signatures were invalid: BADSIG F60F4B3D7FA2AF80 cudatools <cudatools@nvidia.com>
E: The repository 'https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/ppc64el  Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

I’ve install all the required packages:

sudo apt install \
apt-transport-https \
ca-certificates \
curl \
gnupg2

env variables:

OS_DISTRO="ubuntu"
OS_VERSION="1804"
OS_ARCH="ppc64el"

# package versions
CUDA_VERSION="10.1"
CUDA_MAJOR_VERSION=`echo $CUDA_VERSION | cut -d. -f1`
CUDA_MINOR_VERSION=`echo $CUDA_VERSION | cut -d. -f2`
CUDNN_VERSION="7.6.2.24"
CUDNN_MAJOR_VERSION=`echo $CUDNN_VERSION | cut -d. -f1`
NCCL2_VERSION="2.4.7"
TENSORRT_VERSION="5.1.5.0"

imported the gpg keys (which checks out fine):

echo "importing gpg keys for nvidia compute/cuda $OS_DISTRO$OS_VERSION/$OS_ARCH apt repository"
curl -fsSL "https://developer.download.nvidia.com/compute/cuda/repos/$OS_DISTRO$OS_VERSION/$OS_ARCH/7fa2af80.pub" | sudo apt-key add -

setup the sources.list:

echo "deb https://developer.download.nvidia.com/compute/cuda/repos/$OS_DISTRO$OS_VERSION/$OS_ARCH /" \
| sudo tee /etc/apt/sources.list.d/cuda.list
echo "deb https://developer.download.nvidia.com/compute/machine-learning/repos/$OS_DISTRO$OS_VERSION/$OS_ARCH /" \
| sudo tee /etc/apt/sources.list.d/nvidia-ml.list
sudo apt update

Can someone fix the repo?

I am having the same issue on a freshly installed ubuntu 18.04