root@ubuntu:~# apt-get update
Err http://security.ubuntu.com precise-security InRelease

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

Err http://archive.canonical.com precise InRelease

Err http://extras.ubuntu.com precise InRelease

Err http://archive.ubuntu.com lucid InRelease

Err http://archive.canonical.com precise Release.gpg
  Temporary failure resolving 'archive.canonical.com'
Err http://extras.ubuntu.com precise Release.gpg
  Temporary failure resolving 'extras.ubuntu.com'
Err http://archive.ubuntu.com lucid Release.gpg
  Temporary failure resolving 'archive.ubuntu.com'
Err http://security.ubuntu.com precise-security Release.gpg
  Temporary failure resolving 'security.ubuntu.com'
Err http://security.ubuntu.com lucid-security Release.gpg
  Temporary failure resolving '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 lucid InRelease

Err http://us.archive.ubuntu.com lucid-updates InRelease

Err http://us.archive.ubuntu.com precise Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com precise-updates Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com precise-backports Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com lucid Release.gpg
  Temporary failure resolving 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com lucid-updates Release.gpg
  Temporary failure resolving '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://archive.canonical.com/ubuntu/dists/precise/InRelease

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

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/lucid/InRelease

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/lucid/InRelease

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

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

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Temporary failure resolving 'security.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/lucid-security/Release.gpg  Temporary failure resolving 'security.ubuntu.com'

W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'archive.canonical.com'

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'extras.ubuntu.com'

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/lucid/Release.gpg  Temporary failure resolving 'archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/lucid/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/lucid-updates/Release.gpg  Temporary failure resolving 'us.archive.ubuntu.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
root@ubuntu:~#