[ubuntu] 12.04-How does "it" know that "Updates [are] Available"?

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http://ubuntuforums.org – I don't want any "checking for updates" without my strict permission... Is this not a security issue? All of this began with getting the auto-downloading disabled: http://ubuntuforums.org/showthread.php?t=2029959 Also see this more general thread on automatic updates: http://ubuntuforums.org/showthread.php?t=2031754 Attached Images 081012screenshop.jpg (72.3 KB) (Hardware)