[64 bit] W: Failed to fetch .... No such file or directory

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http://ubuntuforums.org – maybe this is a dumb question, but I am just a newbie .... so I really need your help that is experienced and proficient in linux operating system. I faced a problem like this :: when i run the command # apt-get update in terminal error messages appear :roll: Code: Get:437 http://archive.ubuntu.com precise-backports/universe Translation-en [9,880 B] Get:438 http://archive.ubuntu.com precise-security/main Translation-en [85.2 kB] Get:439 http://archive.ubuntu.com precise-security/restricted Translation-en [978 B] Get:440 http://archive.ubuntu.com precise-security/universe Translation-en [3 (Hardware)