I have tried several things to attempt to fix my sudoers file however it is still coming up with errors. The error says
sudu: can't open /etc/sudoers: permission denied
sudo: no valid sudoers sources found, quitting

my permissions for /etc/sudoers are -r--r-----
my permissions for /etc are drw-r--r--
my permissions for /usr/bin/sudo are -rwsr-xr-x

the sudoers configuration file is set to the default as I have ran a dpkg on it, have also uninstalled and reinstalled it, and went over the configuration file ensuring it looked like the defaults I had seen online. Could somebody please help me get this fixed I have been trying everything to get this to work, and have used vast amounts of google research but to no avail. Thank you.

By the way the pertinent information from my uname -a is 2.6.35-28-generic-pae #50-Ubuntu SMP i686 GNU/Linux

If your user account is already having sudo privileges (default case in Ubuntu), then run

$ sudo visudo

or,

$ sudo su -
# visudo

Yeah sudo won't even work from root. It has the default configuration, and I have tried it from a user that I added to the sudo group, and I still get the same error. I can edit the configuration file using visudo from root though. I am attaching a copy of my configuration file.

Attached Thumbnails

 

Try adding your user after the root entry.
Eg:
root ALL=(ALL) ALL
r2g2btru ALL=(ALL) ALL

It's not the ideal setup, but its probably the one you want if you just want basic sudo setup.

I tried adding the user manually like that but it still doesn't work, remember it doesn't even work with root, the issue is whatever is causing this error code "sudu: can't open /etc/sudoers: permission denied
sudo: no valid sudoers sources found, quitting" I tried to check /var/log/messages and /var/log/secure to figure out what is causing this error but to no avail, is there a log specific to sudo, or is there a way to make sudo log is errors in a specific file? Does anybody know how to fix this issue, its been causing me headaches, it should be simple but for some reason everything I try fails.

Are you sure that your /etc directory's permissions are 0644? My /etc directory is 0755 (drwxr-xr-x) - when I set a directory to 0644 and try to list the files I get the same permission denied error you described.

Without x permission, the directory is not searchable.

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r2g2btru
Did sudo ever work?
fedora dose NOT set it by default nor uses it by default
so you used the not recomended fedora hack to allow root to loggin into the GUI ( gnome/KDE)
if so that hack can have unknown bad consequences , like things NOT WORKING .

or

sudo dose not work from the terminal after su -
but if this -- why???

to edit that file
run it as root

1 members found this post helpful.

Thank you so much that resolved my issue. I figured it was something that simple, I just couldn't figure it out, I tried all the more difficult steps first like dpkg, and reconfiguring, and so on. Thank you for your assistance. The other guy that was working on this server had switched these permissions in his attempt to get ftp working, which he failed at, in the end I got sftp and ssh working and have been trying to get sudo to work for a week. Thank you for your assistance.