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How to fix: GPG error: stable InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY

To just add the missing keys, this command should work (replace the “63F7D4AFF6D61D45” string with your actual missing keys)

$ sudo apt-key adv --keyserver --recv-keys 63F7D4AFF6D61D45
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