Errore Vnc server

[davix10]

Salve a tutti, ho provato a seguire una guida per installare Vnc ma ottengo sempre un errore:

Code: Select all

WARNING: The following packages cannot be authenticated!
  tightvnc-java tightvncserver xfonts-base
Install these packages without verification [y/N]? y
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/contrib tightvnc-java all 1.2.7-8
  Temporary failure resolving 'mirrordirector.raspbian.org'
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main tightvncserver armhf 1.3.9-6.4
  Temporary failure resolving 'mirrordirector.raspbian.org'
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main xfonts-base all 1:1.0.3
  Temporary failure resolving 'mirrordirector.raspbian.org'
Failed to fetch http://mirrordirector.raspbian.org/raspbian/pool/contrib/t/tightvnc-java/tightvnc-java_1.2.7-8_all.deb  Temporary failure resolving 'mirrordirector.raspbian.org'
Failed to fetch http://mirrordirector.raspbian.org/raspbian/pool/main/t/tightvnc/tightvncserver_1.3.9-6.4_armhf.deb  Temporary failure resolving 'mirrordirector.raspbian.org'
Failed to fetch http://mirrordirector.raspbian.org/raspbian/pool/main/x/xfonts-base/xfonts-base_1.0.3_all.deb  Temporary failure resolving 'mirrordirector.raspbian.org'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Qualcuno mi può aiutare?