> apt-get update
Err http://us.archive.ubuntu.com precise InRelease

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

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

Err http://us.archive.ubuntu.com precise-backports 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://security.ubuntu.com precise-security Release.gpg
  Temporary failure resolving 'security.ubuntu.com'
Err http://us.archive.ubuntu.com precise-backports 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://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://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Temporary failure resolving 'security.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: Some index files failed to download. They have been ignored, or old ones used instead.


ping google.com
ping: unknown host google.com

ping 74.125.157.104
PING 74.125.157.104 (74.125.157.104) 56(84) bytes of data.

--- 74.125.157.104 ping statistics ---
73 packets transmitted, 0 received, 100% packet loss, time 72019ms