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I'm using Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-31-virtual x86_64) and changed the permissions of the "etc" directory to 444 (sudo chmod 444 etc). I now cant change the permissions to anything else and am receiving the following message: 

$ sudo chmod 777 etc
sudo: unable to open /etc/sudoers: Permission denied
sudo: no valid sudoers sources found, quitting

I've tried to change to root user and change the permissions but I am prompted for a password which I was never asked to set, and am presented with this message: 

$ su
Password:
su: Authentication failure
Tony Nesday
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3 Answers3

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You should boot into "Ubuntu recovery mode" and change permissions back to /etc to 755:

https://askubuntu.com/questions/115358/changed-etc-permission-in-oneiric-ubuntu11-10-by-using-sudo-chmod-665-etc

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dAm2K
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0

Reboot into single-user mode and fix the permissions on /etc from there.

hobbs
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You've changed the permissions of the folder where the sudo's configuration files are located.

Try looking here. This person had a similar problem.

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Dfranc3373
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