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Possible Duplicate:
Lightdm won't start Unity automatically
My computer boots to a black screen, what options do I have to fix it?

I have gone through all of these questions on here to figure out how to regain use of my computer. I updated my computer with linux 12.04 and after the reboot i can login then get my background to come up but i have no top bar or a side bar. What do i do?

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marked as duplicate by Jorge Castro, Mitch, Takkat, Tom Brossman, hbdgaf Sep 24 '12 at 19:18

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.

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So, not 'black screen', but no side-bar (Unity) !? –  david6 May 27 '12 at 6:29
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This is a closer duplicate, with good answers. –  Tom Brossman Sep 24 '12 at 19:12
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1 Answer 1

This can be caused by multiple reasons. Try to reset unity. To to so, go to terminal

Just press Ctrl+Alt+T to start a user terminal.

and type:

unity --reset

try this as well:

sudo apt-get install --reinstall unity

IF that does not work or you need more info Click Here

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