This question already has an answer here:

How to reset the root password in ubuntu o.s ?

I have forgotten the root password and tried to login in recovery mode but root password is asked.

merged by Michael Mrozek Dec 23 '14 at 22:20

This question was merged with How can we change root password? because it is an exact duplicate of that question.

  • 1
    While this is definitely a duplicate, note that the answer I gave here is not mentioned in the other Q&A. – goldilocks Nov 17 '14 at 12:57

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