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I almost nothing about Ubuntu. When I try to run the command to install of a package, I am said that 'unable to locate package'

When I try to run sudo apt-get update, the system seems being blocked! Here's what I get:

enter image description here

Does anybody has an idea ?

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This is a duplicate of askubuntu.com/questions/111597/… –  January Aug 22 '12 at 5:22

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