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Last night I downloaded python 3.3 and idle. I turned it on today and the launcher and menu bar disappeared. It didn't even ask for my password and all I see is my desktop. I tried finding answers from many places: Launcher and window menu bar missing after 12.04 upgrade, Unity has disappeared, and How do I reset my Unity configuration?. But they all did not help and I do not know what to do. I tried unity --reset many times and it says reset option is now deprecated. I am not sure if this means anything but sometimes there are internal errors and when I try to show the details some directory which includes /bin. comes out and nothing else. Any help would be greatly appreciated.

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I happened once with me. My problem was a driver error. I uninstalled manually all the proprietary Nvidia drivers, than booted. It was enough to proceed to reinstall them.

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Sorry but I am not really great with computers. Can you explain what you did? – Bryan Aug 24 '13 at 2:14

I followed these instruction and my menu bar is back:

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