Harish 13 Questions 14 Answers 0 Best Answers 23 Points View Profile 0 Harish Asked: August 2, 20192019-08-02T11:16:19+00:00 2019-08-02T11:16:19+00:00In: Unix & Linux Why getting su fail with “Authentication failure error”? 0 Trying to run the su command but getter Authentication failure error awscentoscentos 7linux Share Facebook 1 Answer Voted Oldest Recent Siva 12 Questions 14 Answers 0 Best Answers 20 Points View Profile Siva 2019-08-03T18:16:53+00:00Added an answer on August 3, 2019 at 6:16 pm In every Linux operation system, the root user is disabled by default below you have a command that will help to change as a root user. Then you run the command it works. sudo -i 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment.