Thanks for your bugreport.
This error indicates that something went wrong with the network update, Are you
behind a proxy server?
Does the problem persists or does it go away when you run "sudo apt-get update"
in a terminal window?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
** Changed in: update-manager (Ubuntu)
Assignee: (unassigned) => Michael Vogt (mvo)
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Update manager reporting errors
https://bugs.launchpad.net/bugs/347765
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