Get:4 http://us.archive.ubuntu.com feisty/main Packages [1307kB]
99% [4 Packages gzip 0]            
gzip: stdin: not in gzip format
Err http://us.archive.ubuntu.com feisty/main Packages
  Sub-process gzip returned an error code (1)
Fetched 4B in 1s (2B/s)
Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/feisty/main/binary-i386/Packages.gz  Sub-process gzip returned an error code (1)
Reading package lists... Done
E: Some index files failed to download, they have been ignored, or old ones used instead.