sudo apt-cache policy nvidia-343
nvidia-343:
  Installato: 343.22-0ubuntu1~xedgers14.10.1
  Candidato:  343.22-0ubuntu1~xedgers14.10.1
  Tabella versione:
 *** 343.22-0ubuntu1~xedgers14.10.1 0
        100 /var/lib/dpkg/status