server@server:~$ sudo apt-get  update
Trovato http://it.archive.ubuntu.com vivid InRelease
Scaricamento di:1 http://it.archive.ubuntu.com vivid-updates InRelease [64,4 kB]
Trovato http://security.ubuntu.com vivid-security InRelease 
Trovato http://it.archive.ubuntu.com vivid-backports InRelease                 
Trovato http://security.ubuntu.com vivid-security/main Sources                 
Trovato http://it.archive.ubuntu.com vivid/main Sources
Trovato http://it.archive.ubuntu.com vivid/restricted Sources       
Trovato http://it.archive.ubuntu.com vivid/universe Sources         
Trovato http://security.ubuntu.com vivid-security/restricted Sources
Trovato http://it.archive.ubuntu.com vivid/multiverse Sources           
Trovato http://security.ubuntu.com vivid-security/universe Sources      
Trovato http://it.archive.ubuntu.com vivid/main amd64 Packages
Trovato http://it.archive.ubuntu.com vivid/restricted amd64 Packages    
Trovato http://security.ubuntu.com vivid-security/multiverse Sources    
Trovato http://it.archive.ubuntu.com vivid/universe amd64 Packages
Trovato http://it.archive.ubuntu.com vivid/multiverse amd64 Packages
Trovato http://security.ubuntu.com vivid-security/main amd64 Packages
Trovato http://it.archive.ubuntu.com vivid/main i386 Packages       
Trovato http://it.archive.ubuntu.com vivid/restricted i386 Packages  
Trovato http://security.ubuntu.com vivid-security/restricted amd64 Packages
Trovato http://it.archive.ubuntu.com vivid/universe i386 Packages    
Trovato http://security.ubuntu.com vivid-security/universe amd64 Packages
Trovato http://it.archive.ubuntu.com vivid/multiverse i386 Packages
Trovato http://it.archive.ubuntu.com vivid/main Translation-it
Trovato http://security.ubuntu.com vivid-security/multiverse amd64 Packages
Trovato http://it.archive.ubuntu.com vivid/main Translation-en
Trovato http://it.archive.ubuntu.com vivid/multiverse Translation-it
Trovato http://security.ubuntu.com vivid-security/main i386 Packages
Trovato http://security.ubuntu.com vivid-security/restricted i386 Packages
Trovato http://security.ubuntu.com vivid-security/universe i386 Packages
Trovato http://it.archive.ubuntu.com vivid/multiverse Translation-en 
Trovato http://it.archive.ubuntu.com vivid/restricted Translation-it
Trovato http://security.ubuntu.com vivid-security/multiverse i386 Packages
Trovato http://it.archive.ubuntu.com vivid/restricted Translation-en
Trovato http://it.archive.ubuntu.com vivid/universe Translation-it
Trovato http://security.ubuntu.com vivid-security/main Translation-en
Trovato http://it.archive.ubuntu.com vivid/universe Translation-en
Scaricamento di:2 http://it.archive.ubuntu.com vivid-updates/main Sources [91,7 kB]
Trovato http://security.ubuntu.com vivid-security/multiverse Translation-en    
Trovato http://security.ubuntu.com vivid-security/restricted Translation-en    
Scaricamento di:3 http://it.archive.ubuntu.com vivid-updates/restricted Sources [3.687 B]
Trovato http://security.ubuntu.com vivid-security/universe Translation-en      
Scaricamento di:4 http://it.archive.ubuntu.com vivid-updates/universe Sources [40,4 kB]
Scaricamento di:5 http://it.archive.ubuntu.com vivid-updates/multiverse Sources [1.966 B]
Scaricamento di:6 http://it.archive.ubuntu.com vivid-updates/main amd64 Packages [209 kB]
Scaricamento di:7 http://it.archive.ubuntu.com vivid-updates/restricted amd64 Packages [13,1 kB]
Scaricamento di:8 http://it.archive.ubuntu.com vivid-updates/universe amd64 Packages [111 kB]
Scaricamento di:9 http://it.archive.ubuntu.com vivid-updates/multiverse amd64 Packages [5.195 B]
Scaricamento di:10 http://it.archive.ubuntu.com vivid-updates/main i386 Packages [207 kB]
Scaricamento di:11 http://it.archive.ubuntu.com vivid-updates/restricted i386 Packages [12,8 kB]
Scaricamento di:12 http://it.archive.ubuntu.com vivid-updates/universe i386 Packages [112 kB]
Scaricamento di:13 http://it.archive.ubuntu.com vivid-updates/multiverse i386 Packages [5.383 B]
Scaricamento di:14 http://it.archive.ubuntu.com vivid-updates/main Translation-en [102 kB]
Scaricamento di:15 http://it.archive.ubuntu.com vivid-updates/multiverse Translation-en [2.246 B]
Scaricamento di:16 http://it.archive.ubuntu.com vivid-updates/restricted Translation-en [2.969 B]
Scaricamento di:17 http://it.archive.ubuntu.com vivid-updates/universe Translation-en [65,5 kB]
Trovato http://it.archive.ubuntu.com vivid-backports/main Sources              
Trovato http://it.archive.ubuntu.com vivid-backports/restricted Sources        
Trovato http://it.archive.ubuntu.com vivid-backports/universe Sources          
Trovato http://it.archive.ubuntu.com vivid-backports/multiverse Sources        
Trovato http://it.archive.ubuntu.com vivid-backports/main amd64 Packages       
Trovato http://it.archive.ubuntu.com vivid-backports/restricted amd64 Packages 
Trovato http://it.archive.ubuntu.com vivid-backports/universe amd64 Packages   
Trovato http://it.archive.ubuntu.com vivid-backports/multiverse amd64 Packages 
Trovato http://it.archive.ubuntu.com vivid-backports/main i386 Packages        
Trovato http://it.archive.ubuntu.com vivid-backports/restricted i386 Packages  
Trovato http://it.archive.ubuntu.com vivid-backports/universe i386 Packages    
Trovato http://it.archive.ubuntu.com vivid-backports/multiverse i386 Packages  
Trovato http://it.archive.ubuntu.com vivid-backports/main Translation-en       
Trovato http://it.archive.ubuntu.com vivid-backports/multiverse Translation-en 
Trovato http://it.archive.ubuntu.com vivid-backports/restricted Translation-en 
Trovato http://it.archive.ubuntu.com vivid-backports/universe Translation-en   
Recuperati 1.051 kB in 10s (97,8 kB/s)                                         
W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/vivid-updates/main/binary-amd64/Packages  Somma hash non corrispondente

W: Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/vivid-updates/main/binary-i386/Packages  Somma hash non corrispondente

E: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.