An error has been while trying to use the specified debian archive mirror.
Possible reasons for the error are: incorrect mirror specified mirror is not available(possibly due to an unreliable network connection) mirror broken (for example because an invalid release file was found) mirror does not support the correct debian version.
Additional details maybe available in /var/log/syslog or on virtual console 4
Please check the specified mirror or try a different one
Ecco l errore che mi da se puoi aiutarmi..( un grazie in anticipo)