unable to update ubuntu 14.01

[SISAY ALEMAYEHU]

Dear All,
I just installed ubuntu 14.01 and try to upgdate using sudo apt-get update, it just gave me the following message
[sudo] password for sisay: 
Err http://extras.ubuntu.com trusty InRelease                                  
  
Err http://extras.ubuntu.com trusty Release.gpg                                
  Unable to connect to extras.ubuntu.com:http:
Err http://archive.canonical.com trusty InRelease                              
  
Err http://archive.canonical.com trusty Release.gpg                            
  Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1360:8c01::16). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::16 80]
0% [Connecting to archive.ubuntu.com (91.189.91.14)]

Can you help me please?

Regards,
Sisay
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