[all variants] Can't find repositories

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http://ubuntuforums.org – Where can I find the current repositories? My system is unable to find these repositories. I can ping the server, the 1st two match the ip4 address given. I'm assuming the issue is not related to the server name or ip address for any of them. I didn't try an alternate port. Failed to fetch http://extras.ubuntu.com/ubuntu/dist...source/Sources 404 Not Found [IP: 80] Failed to fetch http://extras.ubuntu.com/ubuntu/dist...-i386/Packages 404 Not Found [IP: 80] Failed to fetch http://us.archive.ubuntu.com/ubuntu/...source/Sources 404 Not Found [IP: (Hardware)