[Linux-Biella] errore update

[carla.fava]

Per favore, mi suggerite come risolvere questa roba?

sudo apt-get update

0% [Connessione a 192.168.0.250 (192.168.0.250)] [Connessione a 
192.168.0.250 (^

(...)
Ign http://archive.canonical.com precise InRelease
Err http://archive.canonical.com precise Release.gpg
   Impossibile connettersi a 192.168.0.250:3128:
Ign http://archive.canonical.com precise Release
Ign http://archive.canonical.com precise/partner TranslationIndex
Err http://archive.canonical.com precise/partner Sources
   Impossibile connettersi a 192.168.0.250:3128:
Err http://archive.canonical.com precise/partner i386 Packages
   Impossibile connettersi a 192.168.0.250:3128:
(...)
ecc.

Grazie
Carla