Issues with Software Sources

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http://askubuntu.com – I just got a problem with software installation and software sources on my Ubuntu. I cant use Application manager to install anything: Could not download all repository indexes The repository may no longer be available or could not be contacted... . Also if I go to software sources>Select Best Server>Choose the best server, then it wants me to reload and then again gives me the same problem. I do have Internet connection and my Ubuntu version is 9.04. (HowTos)