apt-get update failure

[feora]

HI, guys
     os: Ubuntu 14.04.1 LTS
    I can't install any software via apt-get. The following is details
       Err http://archive.ubuntu.com/ubuntu/ trusty/universe iotop amd64 0.6-1
  Could not connect to 58.247.178.239:8081 (58.247.178.239), connection timed out
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/universe/i/iotop/iotop_0.6-1_amd64.deb  Could not connect to 58.247.178.239:8081 (58.247.178.239), connection timed out


I changed  server in the Update Manager Sources dialog and apt-get STILL attempted to connect that same IP address(58.247.178.239).


so what can I do. thks



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