You can make that message disappear if you install "ubuntu-extras-keyring" at 
least that was in Beta. Its due to the new "extras.ubuntu.com"-Repository but 
it should not be related to this update-problem.
See also: https://bugs.launchpad.net/ubuntu/+source/ubuntu-meta/+bug/645434

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Updates not installed when selected and internet is available
https://bugs.launchpad.net/bugs/634664
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