running apt-get update shows GPG error

Posted by Dinesh on Ask Ubuntu See other posts from Ask Ubuntu or by Dinesh
Published on 2012-09-01T02:01:31Z Indexed on 2012/09/01 3:49 UTC
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apt

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gpg

I am getting below GPG error on running the command sudo apt-get update.

W: GPG error: http://in.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]>
W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ precise/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_precise_partner_binary-i386_Packages)

Also, I am not able to install applications from software center. Every time I install it shows a dialog box with the message,

Requires Installation of Untrusted packages
The action would require the installation of packages from not authenticated sources.

OK or Repair options does nothing.

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