Salve a tutti.
Ultimamente quando vado a fare "apt-get update" da superutente questo fallisce e mi compare sul terminale:

codice:
Err http://debian.fastbull.org squeeze Release.gpg                             
  Impossibile connettersi a debian.fastbull.org:80 (194.116.84.7). - connect (111: Connessione rifiutata)
Err http://debian.fastbull.org/debian/ squeeze/contrib Translation-en          
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze/contrib Translation-it          
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze/main Translation-en
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze/main Translation-it
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze/non-free Translation-en
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze/non-free Translation-it
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org squeeze-updates Release.gpg   
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze-updates/contrib Translation-en
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze-updates/contrib Translation-it
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze-updates/main Translation-en
  Impossibile connettersi a debian.fastbull.org:http:
Err http://debian.fastbull.org/debian/ squeeze-updates/main Translation-it
  Impossibile connettersi a debian.fastbull.org:http:
Trovato http://security.debian.org squeeze/updates Release.gpg
Ign http://security.debian.org/ squeeze/updates/contrib Translation-en
Ign http://security.debian.org/ squeeze/updates/contrib Translation-it
Ign http://security.debian.org/ squeeze/updates/main Translation-en
Ign http://security.debian.org/ squeeze/updates/main Translation-it
Trovato http://security.debian.org squeeze/updates Release
Trovato http://security.debian.org squeeze/updates/main Sources
Trovato http://security.debian.org squeeze/updates/contrib Sources
Trovato http://security.debian.org squeeze/updates/main amd64 Packages
Trovato http://security.debian.org squeeze/updates/contrib amd64 Packages
Scaricamento di:1 http://linux.dropbox.com squeeze Release.gpg [489 B]
Ign http://linux.dropbox.com/debian/ squeeze/main Translation-en
Ign http://linux.dropbox.com/debian/ squeeze/main Translation-it
Scaricamento di:2 http://linux.dropbox.com squeeze Release [2603 B]
Scaricamento di:3 http://linux.dropbox.com squeeze/main amd64 Packages [1141 B]
Recuperati 4233 B in 6s (678 B/s)                                              
Lettura elenco dei pacchetti... Fatto
W: Impossibile recuperare http://debian.fastbull.org/debian/di...ze/Release.gpg  Impossibile connettersi a debian.fastbull.org:80 (194.116.84.7). - connect (111: Connessione rifiutata)

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-en.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-it.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-en.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-it.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-en.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-it.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...es/Release.gpg  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-en.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-it.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-en.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile recuperare http://debian.fastbull.org/debian/di...slation-it.bz2  Impossibile connettersi a debian.fastbull.org:http:

W: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.
W: Duplicate sources.list entry http://debian.fastbull.org/debian/ squeeze/main amd64 Packages (/var/lib/apt/lists/debian.fastbull.org_debian_dists_squeeze_main_binary-amd64_Packages)
Non riesco a capire quale sia il problema!
Chiedo il vostro aiuto!

Grazie in anticipo!