similar errors with me as well since couple of hours
W: Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
similar errors with me as well since couple of hours
W: Failed to fetch http:// us-east- 1.ec2.archive. ubuntu. com/ubuntu/ dists/precise- updates/ universe/ binary- amd64/Packages 404 Not Found
W: Failed to fetch http:// us-east- 1.ec2.archive. ubuntu. com/ubuntu/ dists/precise- updates/ main/binary- i386/Packages 404 Not Found
W: Failed to fetch http:// us-east- 1.ec2.archive. ubuntu. com/ubuntu/ dists/precise- updates/ universe/ binary- i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.