Installing software in kubuntu [closed]

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http://stackoverflow.com – I have recently installed kubuntu. I am able to install softwares from muon software center. But when I try to do so from the terminal, I get errors. For instance on trying to update, I get: Err http://archive.canonical.com quantal InRelease Err http://archive.canonical.com quantal Release.gpg Unable to connect to archive.canonical.com:http: Err http://archive.ubuntu.com quantal InRelease Err http://archive.ubuntu.com quantal Release.gpg Unable to connect to archive.ubuntu.com:http: [IP: 80] Reading package lists... Done W: Failed to fetch http://archive.ubuntu. (HowTos)