Running sudo apt-get update fails on my server (that has a 'net connection). Are the servers temporarily broken, or is my apt misconfigured and using old servers? In short, how do I fix this?

Here's the output:

~$ uname -a
Linux nematode 2.6.28-19-server #66-Ubuntu SMP Sat Oct 16 18:41:24 UTC 2010 i686 GNU/Linux

~$ sudo apt-get update
Err http://us.archive.ubuntu.com jaunty Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty/main Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty/restricted Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty/universe Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty/multiverse Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty-updates Release.gpg
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty-updates/main Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty-updates/restricted Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty-updates/universe Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://us.archive.ubuntu.com jaunty-updates/multiverse Translation-en_US
  Could not resolve 'us.archive.ubuntu.com'
Err http://security.ubuntu.com jaunty-security Release.gpg
  Could not resolve 'security.ubuntu.com'
Err http://security.ubuntu.com jaunty-security/main Translation-en_US
  Could not resolve 'security.ubuntu.com'
Err http://security.ubuntu.com jaunty-security/restricted Translation-en_US
  Could not resolve 'security.ubuntu.com'
Err http://security.ubuntu.com jaunty-security/universe Translation-en_US
  Could not resolve 'security.ubuntu.com'
Err http://security.ubuntu.com jaunty-security/multiverse Translation-en_US
  Could not resolve 'security.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty/Release.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty/main/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty/restricted/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty/universe/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty/multiverse/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

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

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty-updates/main/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty-updates/restricted/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty-updates/universe/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/jaunty-updates/multiverse/i18n/Translation-en_US.bz2  Could not resolve 'us.archive.ubuntu.com'

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

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/jaunty-security/main/i18n/Translation-en_US.bz2  Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/jaunty-security/restricted/i18n/Translation-en_US.bz2  Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/jaunty-security/universe/i18n/Translation-en_US.bz2  Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/jaunty-security/multiverse/i18n/Translation-en_US.bz2  Could not resolve 'security.ubuntu.com'

W: Some index files failed to download, they have been ignored, or old ones used instead.
W: You may want to run apt-get update to correct these problems