In Linux, if you just can’t get away from this message:
sudoers is mode 0777, should be 0440
You should do this to very-simply remove the message:
1. Reboot the PC
2. In grub, select Recuvery Mode
3. You will get a black command line window and you will have root rights
4. type chmod 0440 /etc/sudores
This worked nicely for me. No need to do any reinstall. Hope it can be helpful to someone else too.
