[ubuntu] Afeter a sudden shutdown, I can't enter into Ubuntu

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http://ubuntuforums.org – I have Ubuntu 11/10 through Windows, by wubi. After some odd behaviours, (windows getting stuck in the main upper bar, and the like), and after a forced shut down because the system was stuck this time, I cannot open Ubuntu anymore. When I have to choose between Windows and Ubuntu, and after choosing this last one, the following lines shows up GNU GRUB version 1.99-12ubuntu5 Minimal Bash-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions. Grub> Possible commands are . (Hardware)