Why i see the following errors while updating in terminal?

Posted by Harsh on Ask Ubuntu See other posts from Ask Ubuntu or by Harsh
Published on 2012-11-01T09:11:30Z Indexed on 2012/11/01 11:15 UTC
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Reading package lists... Done W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.

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