when seraching for updates and a repo failed due to secruity resons. It will state its public keys in the "sudo apt update" command. Then with the 
"sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ___________" 
command, input the keys in the ______________ space.

Also edit the ~/.bashrc file and add this alisis to make for adding keys easyer:
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alias add-repo-key='sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys'
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Then I will only need to use the "add-repo-key" command.