Public bug reported:

After updating to precise, whenever I run apt-get update, there are a number of 
errors that come up in the terminal:
W: GPG error: http://extras.ubuntu.com precise Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 16126D3A3E5C1192
W: GPG error: http://archive.canonical.com precise Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://security.ubuntu.com precise-security Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://us.archive.ubuntu.com precise Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://us.archive.ubuntu.com precise-updates Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://us.archive.ubuntu.com precise-backports Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY 40976EAF437D05B5

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/995170

Title:
  gpg errors after upgrade to precise

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