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Errore grafico Intel ppa dopo l'aggiornamento apt-get
come posso ignorare questo messaggio? W: GPG error: https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 56A3DEF863961D39 W: The repository 'https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to …