sudo apt-get update
Err http://br.archive.ubuntu.com saucy InRelease

Err http://br.archive.ubuntu.com saucy-updates InRelease

Err http://br.archive.ubuntu.com saucy-backports InRelease

Err http://security.ubuntu.com saucy-security InRelease

Err http://br.archive.ubuntu.com saucy Release.gpg
Could not resolve 'br.archive.ubuntu.com'
Err http://br.archive.ubuntu.com saucy-updates Release.gpg
Could not resolve 'br.archive.ubuntu.com'
Err http://security.ubuntu.com saucy-security Release.gpg
Could not resolve 'security.ubuntu.com'
Err http://br.archive.ubuntu.com saucy-backports Release.gpg
Could not resolve 'br.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/saucy/InRelease

W: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/saucy-updates/InRelease

W: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/saucy-backports/InRelease

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

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

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

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

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

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