[Bug 1118753] [NEW] how do i fix this problem

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W:GPG error: http://extras.ubuntu.com quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192, W:GPG error: http://ppa.launchpad.net quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A9A06AEF9CB8DB0, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/main/binary-i386/Packages  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/universe/binary-i386/Packages  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/main/source/Sources  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/restricted/source/Sources  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/universe/source/Sources  404  Not Found [IP: 91.189.91.15 80]
, W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-backports/multiverse/source/Sources  404  Not Found [IP: 91.189.91.15 80]
, E:Some index files failed to download. They have been ignored, or old ones used instead.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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how do i fix this problem
https://bugs.launchpad.net/bugs/1118753
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