Unable to update ubuntu 12.04 LTS

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http://askubuntu.com – I have been unable to update my distro for a while now. When I attempt to do so, I get the following message bit: Failed to download repository information and then the following details, which is just a small snippet of the giant readout I get every time I attempt an update: W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/main/binary... 404 Not Found W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports If anyone can help me fix this, I'd very much appreciate it; this is maddening. (HowTos)