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What is the easiest way to resolve apt-get BADSIG GPG errors?

i am getting these errors for a long time. At first they are not there . Please help me !!!

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG C2518248EEA14886 Launchpad VLC

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marked as duplicate by Lekensteyn, hhlp, Takkat, fossfreedom♦, Bruno Pereira Nov 20 '11 at 12:34

This question was marked as an exact duplicate of an existing question.
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Please run the following at a terminal prompt:

sudo gpg --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5 C2518248EEA14886
sudo gpg --export --armor C2518248EEA14886 | sudo apt-key add -
sudo gpg --export --armor 40976EAF437D05B5 | sudo apt-key add -
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