Fixing problem The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY

gpg –keyserver pgpkeys.mit.edu –recv-key KEY
gpg -a –export KEY | sudo apt-key add -

Example:

gpg –keyserver pgpkeys.mit.edu –recv-key B5B7720097BB3B58
gpg -a –export B5B7720097BB3B58 | sudo apt-key add -

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