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Possible Duplicate:
Unity doesn't load, no Launcher, no Dash appears

Ubuntu Version 11.10: My Unity bar and top menu bar have disappeared. All other features are running, it has happened only for one Login. My 2 year old who fiddled with the system seems to have given it more than it can handle...

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marked as duplicate by fossfreedom, Jorge Castro, Takkat, htorque, RolandiXor Jan 19 '12 at 22:12

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.

You can try unity --reset from a terminal. The manual says:

          This option allows the user to reset profile parameters in  com‐
          piz and restart the Unity shell with default settings.

It should restore unity settings to the original.

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