apt-get install error in Ubuntu

Error:

W: GPG error: http://packages.linuxmint.com tara Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A6616109451BBBF2

We can resolve this error by running the following commands.

#apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A6616109451BBBF2

#apt update