cd; curl -O https://sks-keyservers.net/sks-keyservers.netCA.pem
sudo cp sks-keyservers.netCA.pem /usr/share/ca-certificates/
echo sks-keyservers.netCA.pem | sudo tee -a /etc/ca-certificates.conf
sudo update-ca-certificates
rm ~/sks-keyservers.netCA.pem