[ubuntu] errors caused by bad/old packages, HELP!!

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http://ubuntuforums.org – I'm having issues installing programs because of package errors I have been getting, it seems to boil down to these being the offending entries...please tell me what to type in terminal to get rid of these errors!! Code: W: Failed to fetch http://ca.archive.ubuntu.com/ubuntu/dists/jaunty-backports/main/binary-i... 404  Not Found [IP: 80] W: Failed to fetch http://ca.archive.ubuntu.com/ubuntu/dists/jaunty-backports/restricted/bi... 404  Not Found [IP: 80] W: Failed to fetch http://ca.archive.ubuntu.com/ubunt (Hardware)