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I'm using ubuntu 3.13.0-24-generic. I know root password and login before (my friend can use su command), root password not change but when i using su command it appear " authentication failure", What can i do ?

I can't use sudo too, message " xxx is not in the sudoers file. This incident will be reported." Thanks. i already use my friend accout to login root and "sudo adduser sudo".

  • Do you mean you forgot your password? Adding more details would be helpful. – Chintan May 25 '15 at 15:59
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if your friend is using the same computer as you get him to add you to the sudo group by

    sudo adduser <yourusername> sudo

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