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Obtenir une erreur GPG lors de l'exécution de la commande "Sudo apt-get update"

Utiliser Ubuntu 14.04 LTS (64 bits).

$ Sudo apt-get update   
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.
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Fetched 2,079 kB in 1min 1s (33.7 kB/s)                                        
Reading package lists... Done  
W: GPG error: http://public-repo-1.hortonworks.com HDP InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B9733A7A07513CAD  
W: GPG error: http://public-repo-1.hortonworks.com HDP-UTILS InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B9733A7A07513CAD

Comment puis-je résoudre ce problème?

14.04aptupdatesgnupg
3
kumarhimanshu449

Importer les clés depuis MIT keyserver:

gpg --keyserver pgp.mit.edu --recv-keys B9733A7A07513CAD
gpg -a --export 07513CAD | apt-key add -
3
user294348