How to Fix “The following signatures couldn’t be verified” Error in Ubuntu Linux

Hello all! In this tutorial, we shall see about the common error that occurs in ubuntu update. That is when we use sudo apt-get update we get PUBLIC KEY ERROR in the terminal output. Lets see about the error in the terminal. In ubuntu this error is termed as GPG Error. GPG - Gnu Privacy Guard Why this error occurs first? This happens when we add a non-ubuntu repository to apt sources, but we have not imported the public key that matches the signing key that was used to sign the packages in that repository. So lets see the solution for this error.

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