GPG Key error in ubuntu precise 12.04

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After doing some apt-get update I got this error

GPG error: http://id.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

I had this since I add a new line to update my virtualbox to 5.1 in sources.list

But here is the way to correct the problem.  I got this from here.

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5

It seem the signature key to update the ubuntu has change.

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