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pankaj@pankajbhatt:~$ sudo add-apt-repository ppa:umang/indicator-stickynotes
>>> /etc/sudoers: syntax error near line 1 <<<
sudo: parse error in /etc/sudoers near line 1
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
pankaj@pankajbhatt:~$ 

1 Answers1

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Have you altered /etc/sudoers? It's complaining that there's a "syntax error" in or near the first line of /etc/sudoers. Undo your changes to /etc/sudoers.

waltinator
  • 36,399
  • I recommend [edit]ing this answer to expand it with specific details about how to do this. Editing/fixing a broken sudoers file is not very obvious because you can't use sudo any longer. – David Foerster Jul 17 '16 at 16:03