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This a screenshot of my System Settings window. As you can see I am missing the icons for: "Appearance","Online Accounts", "Security & Privacy", and "Time & Date". How can I restore them?

For comparison this is a screenshot of the default Systems Settings window in Ubuntu 13.10.

marked as duplicate by user.dz, Sylvain Pineau, Eric Carvalho, Florian Diesch, belacqua Jun 11 '14 at 20:53

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Try installing (or reinstalling) the package ubuntu-desktop by:

sudo apt-get install ubuntu-desktop

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