Erro ao tentar atualizar (Ubuntu 12.04 LTS) 64Bits

[Lorran]

Boa tarde, Pessoal

Ao tentar passar o comando apt-get install update aparece essa mensagem não permitindo a atualização:
tate information... Done
E: Unable to locate package update
root@ubuntu:/home/oracle#
root@ubuntu:/home/oracle#

Atte,

Lorran

[Arthur Bernardes]

Os comandos corretos são sudo apt-get update ou sudo apt-get install nome_do_pacote

[Lorran]

ok, outro erro.

oracle@ubuntu:~$ sudo apt-get update
[sudo] password for oracle:
Err http://security.ubuntu.com precise-security InRelease
 
Err http://extras.ubuntu.com precise InRelease
 
Err http://extras.ubuntu.com precise Release.gpg
  Could not resolve 'extras.ubuntu.com'
Err http://security.ubuntu.com precise-security Release.gpg
  Could not resolve 'security.ubuntu.com'
Err http://us.archive.ubuntu.com precise InRelease
 
Err http://us.archive.ubuntu.com precise-updates InRelease
 
Err http://us.archive.ubuntu.com precise-backports InRelease
 
Err http://us.archive.ubuntu.com precise Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com precise-updates Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com precise-backports Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/InRelease 

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease 

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/InRelease 

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/InRelease 

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/InRelease 

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg  Could not resolve 'extras.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.

[Arthur Bernardes]

Está conectado a internet.? Tem algum Proxy.?

Execute em terminal e poste resultados.

cat /etc/apt/sources.list

[Lorran]

Novato sempre criando problemas sem tê-los rs, realmente era a conexão, estou baixando os pacotes pelo próprio atualizador do ubuntu.

Obrigado a todos,