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[ubuntu] Help .. dir etc.. I change permissions

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http://ubuntuforums.org – I change permissions the dir /etc , i can't execute sudo ... sudo output : Code: sudo: /etc/sudoers es escribible por todos sudo: no se encontraron fuentes sudoers válidas, saliendo sudo: no se puede inicializar la política de plugin As I can restore the folder with the correct permissions etc? sorry for my bad English, I speak Spanish. (Hardware)

dayu's picture
Submitted by dayu on 02/05/2013

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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).

sudo cannot open /etc/sudoers 51 weeks 5 days ago

sudo does not work. I have installed Arch onto a USB key, using BTRFS. The output of "sudo" is:

$ sudo sudo: unable to stat /etc/sudoers: Permission denied sudo: no valid sudoers sources found, quitting sudo: unable to initialize policy plugin

$ ls -l /etc/sudoers -r--r----- 1 root root 2849 May 18 15:00 /etc/sudoers

$ lsattr /etc/sudoers --------------- /etc/sudoers

$ strace -u ross sudo true

Recently I had to change the folder permissions of /usr folder. Now the whole sudo is not working.

Tried a million things but I can't restore my root access.

ubuntu@ip-10-252-139-101:~$ sudo su sudo: /etc/sudoers is owned by uid 1000, should be 0 sudo: no valid sudoers sources found, quitting

Sadly I can't boot in restore mode because this is an AWS EC2 instance, I'm afraid I've screwed everything.

I need to sudo for one last time to start mysql service then dump a database.

[ubuntu] Sudo error !! 24 weeks 1 day ago

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?

I kinda screwed up the /etc directory by running:

sudo chmod 417 /etc

Leaving me unable to use sudo:

sudo: can't open /etc/sudoers: permission denied. sudo: no valid sudoers sources foundm quitting

Ive been trying to fix it via recovery mode but i'm not sure to what mode I should set it. (I know sudoers is 0440, but this doesnt fix it because /etc is still messed up.)

Oh and for the future

Whenever I try to do anything at all that requires my password it returns this:

u7ur7l3@ubuntu:~$ sudo sudo: /usr/lib/sudo/sudoers.so must be owned by uid 0 sudo: fatal error, unable to load plugins u7ur7l3@ubuntu:~$

So I can't install anything from the Software Center / package manager or run any commands in terminal that require my password.

Following the wiki's advice, I installed ubuntu-zfs.

I am learning Linux for work, so am still a bit rusty on the edges.

I am needing to change the folder permission of folder /opt, and I know in Linux, you do the following:

chmod 775 /opt

I get a message under that saying:

chmod: WARNING: cannot change /opt/: Operation not permitted (error 1).

Does that mean I need SUDO permissions?