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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.

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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Try the following link, the question is very similar...… – user219006 Nov 24 '13 at 21:03

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

sudo apt-get install ubuntu-desktop
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This did work for me. Thanks. – Sinan Eldem May 11 '14 at 19:59

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