Error with sudo : /etc/sudoers is world writable , no valid sudoers sources found

Question

sudo: /etc/sudoers is world writable
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin

I was installing a font by using this command

sudo gnome-font-viewer /home/user-15/Downloads/aclonica/Aclonica.ttf

I used this before and it worked fine but now it is not working, I'm not able to install any font.

I found a similar post here: http://askubuntu.com/questions/304212/how-to-solve-sudo-etc-sudoers-d-is-world-writable — Erik, Feb 24 '17 at 06:36
@TarunNarula Please edit your question and add what you tried and what didn't work. — MadMike, Feb 24 '17 at 07:03
@TarunNarula Please add what you tried from this question How to solve "sudo: /etc/sudoers.d is world writable" and what didn't work. — MadMike, Feb 24 '17 at 07:16
pkexec chmod 555 /etc/sudoers pkexec chmod 555 /etc/sudoers.d/README — Tarun Narula, Feb 24 '17 at 07:18
@TarunNarula It would be easier to follow what you have tried if you edit and update your question with that information, instead of using comments. — MadMike, Feb 24 '17 at 07:20

Sam Gleske · Answer 1 · 2017-02-24T16:29:14.577

0

Boot up an Ubuntu live distro (via USB or CD).
Mount your root file system. (let's say your root file system was mounted to /mnt)
Execute sudo chmod o-w /mnt/etc/sudoers.

edited Feb 24 '17 at 16:29

answered Feb 24 '17 at 07:17

Sam Gleske

chmod: changing permissions of '/etc/sudoers': Operation not permitted – Tarun Narula Feb 24 '17 at 07:39
From the Ubuntu live CD you need to be root. Added sudo to my answer. – Sam Gleske Feb 24 '17 at 16:28

1 Answers1