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I recently upgraded to Ubuntu 12.10. I am trying to open the dash home, but the sidebar disappears until I click out of it. The dash itself never shows up. sometimes the top of the screen fuzzes up a little bit, but still no dash home.
You could try pressing the Super key (Windows Key):
You can also try reinstalling Unity. Ctrl+Alt+T and then
sudo apt-get install --reinstall unity
Required, but never shown