yulia@yulia-TravelMate-2490:~$ sudo apt-get update
sudo: impossibile risolvere l'host yulia-TravelMate-2490
[sudo] password for yulia: 
Err http://extras.ubuntu.com trusty InRelease
  
Err http://archive.canonical.com trusty InRelease                              
  
Err http://extras.ubuntu.com trusty Release.gpg                                
  Impossibile risolvere "extras.ubuntu.com"
Err http://archive.canonical.com trusty Release.gpg                         
  Impossibile risolvere "archive.canonical.com"
Err http://security.ubuntu.com trusty-security InRelease                    
  
Err http://security.ubuntu.com trusty-security Release.gpg                  
  Impossibile risolvere "security.ubuntu.com"
Err http://it.archive.ubuntu.com trusty InRelease
  
Err http://it.archive.ubuntu.com trusty-updates InRelease
  
Err http://it.archive.ubuntu.com trusty-backports InRelease
  
Err http://it.archive.ubuntu.com trusty-proposed InRelease
  
Err http://it.archive.ubuntu.com trusty Release.gpg
  Impossibile risolvere "it.archive.ubuntu.com"
Err http://it.archive.ubuntu.com trusty-updates Release.gpg
  Impossibile risolvere "it.archive.ubuntu.com"
Err http://it.archive.ubuntu.com trusty-backports Release.gpg
  Impossibile risolvere "it.archive.ubuntu.com"
Err http://it.archive.ubuntu.com trusty-proposed Release.gpg
  Impossibile risolvere "it.archive.ubuntu.com"
W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty/InRelease  

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease  

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty-backports/InRelease  

W: Impossibile recuperare http://security.ubuntu.com/ubuntu/dists/trusty-security/InRelease  

W: Impossibile recuperare http://archive.canonical.com/ubuntu/dists/trusty/InRelease  

W: Impossibile recuperare http://extras.ubuntu.com/ubuntu/dists/trusty/InRelease  

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty-proposed/InRelease  

W: Impossibile recuperare http://extras.ubuntu.com/ubuntu/dists/trusty/Release.gpg  Impossibile risolvere "extras.ubuntu.com"

W: Impossibile recuperare http://archive.canonical.com/ubuntu/dists/trusty/Release.gpg  Impossibile risolvere "archive.canonical.com"

W: Impossibile recuperare http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg  Impossibile risolvere "security.ubuntu.com"

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg  Impossibile risolvere "it.archive.ubuntu.com"

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg  Impossibile risolvere "it.archive.ubuntu.com"

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpg  Impossibile risolvere "it.archive.ubuntu.com"

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/trusty-proposed/Release.gpg  Impossibile risolvere "it.archive.ubuntu.com"

W: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.
E: dpkg è stato interrotto. È necessario eseguire "sudo dpkg --configure -a" per correggere il problema. 
yulia@yulia-TravelMate-2490:~$ 
