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I am now using ubuntu12.04 with kernel 3.2.0-48. Where can i find some logs which will help me to find the reason? sorry for my poor english.

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marked as duplicate by Warren Hill, Raja, Mitch, Eliah Kagan, belacqua Aug 1 '13 at 21:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

The following link may be of help and shows how to check boot errors:

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