Saudações Claudio Novais, tudo bem? Em relação ao pequeno problema do UPDATE no terminal, logo no começo que instalei o Ubuntu Desktop em meu notebook eu digitei essa linha de comando no terminal "sudo apt-get update" e por começo apareceu esses erros que mostrei no começo de minhas perguntas, mas nunca editei, só agora que estou editando diante do pequeno problema que citei anteriormente. Substitui o que me pediu e ficou assim no meu sources.list...
## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb 
http://extras.ubuntu.com/ubuntu quantal main
deb 
http://archive.canonical.com/ubuntu quantal partner
deb-src 
http://archive.canonical.com/ubuntu quantal partner
deb 
http://br.archive.ubuntu.com/ubuntu/ quantal-proposed restricted main multiverse universe
# deb-src 
http://extras.ubuntu.com/ubuntu quantal main
Ao executar o comando no terminal ficou desse jeito...
luciano@luciano-Aspire-one:~$ sudo apt-get update
Atingido 
http://br.archive.ubuntu.com quantal Release.gpg
Atingido 
http://dl.google.com stable Release.gpg                               
Atingido 
http://br.archive.ubuntu.com quantal-updates Release.gpg              
Atingido 
http://br.archive.ubuntu.com quantal-backports Release.gpg            
Atingido 
http://archive.canonical.com quantal Release.gpg                      
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal-security Release.gpg             
Atingido 
http://extras.ubuntu.com quantal Release.gpg                          
Atingido 
http://dl.google.com stable Release                                   
Atingido 
http://br.archive.ubuntu.com quantal-proposed Release.gpg             
Atingido 
http://archive.canonical.com quantal Release                          
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal Release                          
Atingido 
http://br.archive.ubuntu.com quantal-updates Release                  
Atingido 
http://extras.ubuntu.com quantal Release                              
Atingido 
http://dl.google.com stable/main i386 Packages                        
Atingido 
http://br.archive.ubuntu.com quantal-backports Release                
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://archive.canonical.com quantal/partner Sources                  
Atingido 
http://br.archive.ubuntu.com quantal-security Release                 
Atingido 
http://br.archive.ubuntu.com quantal-proposed Release                 
Atingido 
http://extras.ubuntu.com quantal/main i386 Packages                   
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal/main Sources                     
Atingido 
http://archive.canonical.com quantal/partner i386 Packages            
Atingido 
http://br.archive.ubuntu.com quantal/restricted Sources               
Atingido 
http://br.archive.ubuntu.com quantal/universe Sources                 
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal/multiverse Sources               
Atingido 
http://br.archive.ubuntu.com quantal/main i386 Packages               
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal/restricted i386 Packages         
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal/universe i386 Packages           
Atingido 
http://br.archive.ubuntu.com quantal/multiverse i386 Packages         
Atingido 
http://br.archive.ubuntu.com quantal/main Translation-pt_BR           
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http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal/main Translation-pt              
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http://br.archive.ubuntu.com quantal/main Translation-en              
Atingido 
http://ppa.launchpad.net quantal Release.gpg                          
Atingido 
http://br.archive.ubuntu.com quantal/multiverse Translation-pt_BR     
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http://br.archive.ubuntu.com quantal/multiverse Translation-pt        
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http://br.archive.ubuntu.com quantal/multiverse Translation-en        
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal/restricted Translation-pt_BR     
Atingido 
http://br.archive.ubuntu.com quantal/restricted Translation-pt        
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal/restricted Translation-en        
Atingido 
http://br.archive.ubuntu.com quantal/universe Translation-pt_BR       
Atingido 
http://br.archive.ubuntu.com quantal/universe Translation-pt          
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal/universe Translation-en          
Atingido 
http://br.archive.ubuntu.com quantal-updates/main Sources             
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal-updates/restricted Sources       
Atingido 
http://ppa.launchpad.net quantal Release                              
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http://br.archive.ubuntu.com quantal-updates/universe Sources         
Atingido 
http://br.archive.ubuntu.com quantal-updates/multiverse Sources       
Atingido 
http://br.archive.ubuntu.com quantal-updates/main i386 Packages       
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal-updates/restricted i386 Packages 
Atingido 
http://br.archive.ubuntu.com quantal-updates/universe i386 Packages   
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal-updates/multiverse i386 Packages 
Ign 
http://dl.google.com stable/main Translation-pt_BR                         
Ign 
http://dl.google.com stable/main Translation-pt                            
Ign 
http://archive.canonical.com quantal/partner Translation-pt_BR             
Atingido 
http://br.archive.ubuntu.com quantal-updates/main Translation-en      
Ign 
http://dl.google.com stable/main Translation-en                            
Ign 
http://archive.canonical.com quantal/partner Translation-pt                
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal-updates/multiverse Translation-en
Ign 
http://archive.canonical.com quantal/partner Translation-en                
Ign 
http://extras.ubuntu.com quantal/main Translation-pt_BR                    
Atingido 
http://ppa.launchpad.net quantal Release                              
Atingido 
http://br.archive.ubuntu.com quantal-updates/restricted Translation-en
Atingido 
http://ppa.launchpad.net quantal/main Sources                         
Ign 
http://extras.ubuntu.com quantal/main Translation-pt     
Atingido 
http://br.archive.ubuntu.com quantal-updates/universe Translation-en  
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages                   
Ign 
http://extras.ubuntu.com quantal/main Translation-en     
Atingido 
http://br.archive.ubuntu.com quantal-backports/main Sources
Atingido 
http://br.archive.ubuntu.com quantal-backports/restricted Sources
Atingido 
http://br.archive.ubuntu.com quantal-backports/universe Sources
Atingido 
http://br.archive.ubuntu.com quantal-backports/multiverse Sources
Atingido 
http://br.archive.ubuntu.com quantal-backports/main i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-backports/restricted i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-backports/universe i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-backports/multiverse i386 Packages
Atingido 
http://ppa.launchpad.net quantal/main Sources
Atingido 
http://br.archive.ubuntu.com quantal-backports/main Translation-en
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages
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http://br.archive.ubuntu.com quantal-backports/multiverse Translation-en
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http://br.archive.ubuntu.com quantal-backports/restricted Translation-en
Atingido 
http://br.archive.ubuntu.com quantal-backports/universe Translation-en
Atingido 
http://br.archive.ubuntu.com quantal-security/main Sources
Atingido 
http://ppa.launchpad.net quantal/main Sources
Atingido 
http://br.archive.ubuntu.com quantal-security/restricted Sources
Atingido 
http://br.archive.ubuntu.com quantal-security/universe Sources
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-security/multiverse Sources
Atingido 
http://br.archive.ubuntu.com quantal-security/main i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-security/restricted i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-security/universe i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-security/multiverse i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-security/main Translation-en
Atingido 
http://br.archive.ubuntu.com quantal-security/multiverse Translation-en
Atingido 
http://ppa.launchpad.net quantal/main Sources
Atingido 
http://br.archive.ubuntu.com quantal-security/restricted Translation-en
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-security/universe Translation-en
Atingido 
http://br.archive.ubuntu.com quantal-proposed/restricted i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-proposed/main i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-proposed/multiverse i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-proposed/universe i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-proposed/main Translation-en
Atingido 
http://ppa.launchpad.net quantal/main Sources       
Atingido 
http://br.archive.ubuntu.com quantal-proposed/multiverse Translation-en
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages
Atingido 
http://br.archive.ubuntu.com quantal-proposed/restricted Translation-en
Atingido 
http://br.archive.ubuntu.com quantal-proposed/universe Translation-en
Atingido 
http://ppa.launchpad.net quantal/main Sources
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages
Atingido 
http://ppa.launchpad.net quantal/main Sources       
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages 
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages 
Atingido 
http://ppa.launchpad.net quantal/main Sources       
Atingido 
http://ppa.launchpad.net quantal/main i386 Packages 
Ign 
http://br.archive.ubuntu.com quantal-updates/main Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-updates/main Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-updates/multiverse Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-updates/multiverse Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-updates/restricted Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-updates/restricted Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-updates/universe Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-updates/universe Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-backports/main Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-backports/main Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-backports/multiverse Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-backports/multiverse Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-backports/restricted Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-backports/restricted Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-backports/universe Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-backports/universe Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-security/main Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-security/main Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-security/multiverse Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-security/multiverse Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-security/restricted Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-security/restricted Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-security/universe Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-security/universe Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-proposed/main Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-proposed/main Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-proposed/multiverse Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-proposed/multiverse Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-proposed/restricted Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-proposed/restricted Translation-pt
Ign 
http://br.archive.ubuntu.com quantal-proposed/universe Translation-pt_BR
Ign 
http://br.archive.ubuntu.com quantal-proposed/universe Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Ign 
http://ppa.launchpad.net quantal/main Translation-pt_BR
Ign 
http://ppa.launchpad.net quantal/main Translation-pt
Ign 
http://ppa.launchpad.net quantal/main Translation-en
Lendo listas de pacotes... Pronto
W: Duplicate sources.list entry 
http://archive.canonical.com/ubuntu/ quantal/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_quantal_partner_binary-i386_Packages)
W: Você terá que executar apt-get update para corrigir estes problemas
É estranho existir um duplicidade e o gedit não alterado por mim como havia descrito o mesmo!
Estou dando um trabalho hen, espero que me compreendam e que por favor me ajudem, ainda existem outros mínimos problemas que ao resolvermos esse do UPDATE eu descreverei!