/Shell/Bash/Ubuntu The following signatures couldn't be verified because the public key is not available: NO_PUBKEY

Ubuntu The following signatures couldn't be verified because the public key is not available: NO_PUBKEY

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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