Just updated my 12.04 to 12.10, my Dell Latitude 630 laptop and everything is OK. Next my Gigabyte desktop and oops, I see no icons, no way to open terminal - can open file browser, new docs with LibreOffice and even Firefox - but not the Ubuntu programs nor the terminal. Pressing the Meta-key (or what it is called, Windows-key on my keyboard) renders nothing. I do not have Ubuntu bootdisk (updated via UpdateManager) - what can I do? I am a bit in the country so I cannot walk into the next shop... tried to burn a new 12.10 bootdisk from the net, but no success. Is there a way to do something without the terminal or could I possibly open the terminal manually (finding the program)?
You can open terminal using Ctrl + Alt + T
I don't understnd your question. You mean your Unity and upper bar disappeared? I had problem like this after updating my nVidia graphic card drivers. But also got problem with resolution (dropped to 1152 x 864 from 1920 x 1080).