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The following signatures couldn't be verified because the public key is not available: NO_PUBKEY Code Example
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6494C6D6997C215E
ubuntu The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys <YOUR KEY COMES HERE>
Source: askubuntu.com
he following signatures couldn't be verified because the public key is not available: NO_PUBKEY 363A96A5CEA9EA27 
sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys 363A96A5CEA9EA27
Source: unix.stackexchange.com
ubuntu 18.04 jenkins The following signatures couldn't be verified because the public key is not available: 
Utils:

https://www.digitalocean.com/community/tutorials/how-to-install-jenkins-on-ubuntu-18-04

https://pkg.jenkins.io/debian-stable/

Solve the problem by adding this:
wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -



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