W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: wheezy-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A97AE96A0BEB6D3C

W: Failed to fetch

  1. # Solution:
  2. apt-get -t wheezy-updates install debian-cyconet-archive-keyring
  3. apt-get update

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