I've upgraded to 13.04 and some things are missing. I can neither open the system settings nor the "displays" app to change dual monitor settings.
When I click on "System Settings..." in the top right corner nothing happens. And on the top right there's no more date/time shown, I presume I could change that in the settings.
How do I get the "Systems Settings" and "Displays" app back? I can't find the right packages.