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I am using a Ubuntu system. Today, I accidentally changed the sudoers file in /etc due to which my normal user prathmesh is not able to perform sudo operation. I don't know how to go to the root mode. I am trying "su" but it is giving me authentication failure error. Plus I don't remember setting root user's password ever.

What is the best way to solve this situation ?? Use a live CD to change the sudoers file or something else ??

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You have two easy ways:

  1. use the Ubuntu installation CD, choose the "rescue a system" option and then drop into the shell (of the target system) to change the password of the user(s) or modify the /etc/sudoers to your liking.
  2. boot into single user mode and modify the passwords or /etc/sudoers.

The second method may be hard on more recent Ubuntu versions where GRUB doesn't wait for you to choose the single user mode.

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