[ubuntu] Update Manager

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http://ubuntuforums.org – At the moment my Update Manager is holding a very long list of security updates. A window opened and gave me a Warning some of the packages are "not authenticate" so.... I am.....:confused: How come there are so many ( 823.8 MB) updates? How do I know which security update to allow Update Manager to install? Any advise is appreciated because I don't understand. Thanks in advance (Hardware)