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I just upgraded to 12.10 from 12.04 and now I don't have the side bar to access the dash tab.I have also lost the bar at the top that shows the volume and internet connection.

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Try logging in, press Ctrl+Alt+T, then put in this command: "unity --replace", without the quotation marks. Does Unity start? – Dominic Jordan Hasford Oct 21 '12 at 23:39

I finally resolved this by creating a live cd, running it and choosing the option to reinstall without getting rid of my existing files and folders. Everything is back and working fine.

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