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I've just upgrade from Ubuntu 10.04 to 11.10 on my Mac(OS X) but after it has restarted, it would not open after selecting the Ubuntu launcher. I have a black screen with a flashing bar and cannot do anything else en ubuntu. The partition that has Mac is fully functional. What can I do to recuperate the ubuntu partition and make it work?

Thank you.

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Even if I am sure you have done it already, my first advice would be to wait even longer to see if the boot process works after a longer time. Then, what happens when you type Ctrl+Alt+F1?

Are you able to run a Live CD of Ubuntu? This would permit you to get your data back and to repair your installation.

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