This problem might occur if you are behind corporate proxy and corporation uses its own certificate. Just add “–no-check-certificate” in the command.
e.g.
wget –no-check-certificate -qO – http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add –
It works.
If you want to see what is going on, you can use verbose command instead of quiet before adding “–no-check-certificate” option.
gpg no valid openpgp data found
e.g.
wget -vO – http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add –
This will tell you to use “–no-check-certificate” if you are behind proxy.
Managed to resolve it.
separated the command in to two commands and used directly the file name which was downloaded
example –
wget -q -O – https://pkg.jenkins.io/debian/jenkins-ci.org.key | sudo apt-key add –
can be separated into
wget -q -O – https://pkg.jenkins.io/debian/jenkins-ci.org.key
sudo apt-key add jenkins-ci.org.key