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A partial upgrade was completed from 12.04 to 12.10.

i can log in but after that nothing happens. no response to the alt keys unless its the alt and Sysrq or ctrl Alt Del.

Thanks in advance

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Please give more details on the state of the OS after your login - Do you have a blank screen, or are you actually logged in? What Desktop Environment do you use? Does this answer help you? – user98085 Jan 3 '13 at 1:23
i am logged in. Unity is the environment – user118294 Jan 3 '13 at 1:25

Maybe compiz (or its many plugins, specifically windows decorations) failed to start after the upgrade. Try to start the ccsm tool and enable them using alt+f2 if you are able to.

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