apt-get update

Ign http://us-east-1.ec2.archive.ubuntu.com lucid/main Packages          
Ign http://us-east-1.ec2.archive.ubuntu.com lucid/universe Packages
Ign http://us-east-1.ec2.archive.ubuntu.com lucid/main Sources
Ign http://us-east-1.ec2.archive.ubuntu.com lucid/universe Sources
Ign http://us-east-1.ec2.archive.ubuntu.com lucid-updates/main Packages
Ign http://us-east-1.ec2.archive.ubuntu.com lucid-updates/universe Packages
Ign http://us-east-1.ec2.archive.ubuntu.com lucid-updates/main Sources
Hit http://ppa.launchpad.net karmic Release.gpg
Ign http://us-east-1.ec2.archive.ubuntu.com lucid-updates/universe Sources
Err http://us-east-1.ec2.archive.ubuntu.com lucid/main Packages
  403  Forbidden [IP: 10.202.26.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com lucid/universe Packages
  403  Forbidden [IP: 10.202.26.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com lucid/main Sources
  403  Forbidden [IP: 10.202.26.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com lucid/universe Sources
  403  Forbidden [IP: 10.202.26.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com lucid-updates/main Packages
  403  Forbidden [IP: 10.202.26.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com lucid-updates/universe Packages
  403  Forbidden [IP: 10.202.26.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com lucid-updates/main Sources
  403  Forbidden [IP: 10.202.26.15 80]

host

$ host us-east-1.ec2.archive.ubuntu.com
us-east-1.ec2.archive.ubuntu.com has address 10.252.111.96
us-east-1.ec2.archive.ubuntu.com has address 10.202.26.15
us-east-1.ec2.archive.ubuntu.com has address 10.250.142.223

workarround

$ echo "10.250.142.223 us-east-1.ec2.archive.ubuntu.com" | sudo tee -a /etc/hosts