Hit http://security.ubuntu.com feisty-security/universe Packages     
Hit http://medibuntu.sos-sts.com feisty/free Packages                
99% [10 Packages gzip 0] [Connecting to us.archive.ubuntu.com (91.189.89.6)] [Wa
gzip: stdin: not in gzip format
Err http://archive.ubuntu.com feisty/universe Packages                          
  Sub-process gzip returned an error code (1)
Hit http://medibuntu.sos-sts.com feisty/non-free Packages