problema:
Aggiornando i repository di Debian Linux compaiono i messaggi di errore seguenti.
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5E3C45D7B312C643
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5E3C45D7B312C643
W: Failed to fetch http://repository.spotify.com/dists/stable/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5E3C45D7B312C643
soluzione:
# curl -sS https://download.spotify.com/debian/pubkey_5E3C45D7B312C643.gpg | apt-key add -
verificare con
# apt update