How to change DNS in Ubuntu?

DNS(Domain Name System)

Google public dns

• open NETWORK option in system settings
  
   
•  click options in the window that appears
                          
  • Select the IPv4 Settings or IPv6 Settings  
    
    
  •  select Automatic (DHCP) addresses only and enter DNS server add.
     in DNS server field
                     
    

    • For IPv4: 8.8.8.8 and/or 8.8.4.4.
    • For IPv6: 2001:4860:4860::8888 and/or 2001:4860:4860::8844

       
    
     save your current options and enjoy
    
    
    
    
    
     
    
    

    
    

    
    

    
    

     

    
    

    
    

    
    

    
    
    

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How to switch Ubuntu, from GUI to text mode?

transforming from GUI to text mode is really simple process:


                              Press ‘Ctrl + Alt + F1′ - GUI to text mode

                              Press 'Alt +F7'             -  back to GUI

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Turn off guest session in Ubuntu 12.04

• open terminal
• enter following command  
          
                                   gksu gedit /etc/lightdm/lightdm.conf
  
   
•  add    allow-guest=false to lightdm.conf file
• then restart lightdm using command                                                                                                                     
  
  
                                    sudo restart lightdm
  
  
  Thank You 

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