Sudo error !!

[ufo159]

I have changed the permissions of some system folders and now when i want to install a program it shows this error:

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

Any help?

[dino99]

now you know what happens when changing permission(s) without understanding linux :(

better to start a new clean installation.

http://ubuntuforums.org/showpost.php?p=11843514&postcount=9