help on fixing sudoer

[rburkartjo]

hacking again and messed up how do i correct

ay@ray-desktop:~$ sudo apt-get update && sudo apt-get dist-upgrade
>>> /etc/sudoers: syntax error near line 25 <<<
sudo: parse error in /etc/sudoers near line 25
sudo: no valid sudoers sources found, quitting
ray@ray-desktop:~$



tks in advance

[rburkartjo]

and again

ray@ray-desktop:~$ sudo visudo
>>> /etc/sudoers: syntax error near line 25 <<<
sudo: parse error in /etc/sudoers near line 25
sudo: no valid sudoers sources found, quitting
ray@ray-desktop:~$

[sisco311]

Reboot in Recovery Mode and edit the file:
http://psychocats.net/ubuntu/fixsudo

The default file looks like this:

# /etc/sudoers
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the man page for details on how to write a sudoers file.
#

Defaults	env_reset

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root	ALL=(ALL) ALL

# Uncomment to allow members of group sudo to not need a password
# (Note that later entries override this, so you might need to move
# it further down)
#%sudo ALL=NOPASSWD: ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

[ViRMiN]

Your best option would probably be to boot from the live CD, mount your hard-disk partitions and then edit your troubled /etc/sudoers file using visudo.

Using visudo will warn you of errors before saving. Don't save the file if there are errors - as you've seen it causing a bit of grief but, as long as you've physical access to the box it's not too big an issue.

[rburkartjo]

vir good idea will try that couldnt get what sisco said to work and he usually has good advise
tks

[sisco311]

Your best option would probably be to boot from the live CD, mount your hard-disk partitions and then edit your troubled /etc/sudoers file using visudo.

Using visudo will warn you of errors before saving. Don't save the file if there are errors - as you've seen it causing a bit of grief but, as long as you've physical access to the box it's not too big an issue.

Editing the file with visudo from a live cd or another linux distro is a little tricky. You have to chroot to the Ubuntu installation.

assuming that the root partition is mounted under /media/ubuntu:

sudo chroot /media/ubuntu
VISUAL=gedit visudo

should do the trick.

for a fully functional chroot environment you have to mount some virtual filesystems:

sudo mount -t sysfs none /media/ubuntu/sys
sudo mount -t proc none /media/ubuntu/proc
sudo mount --bind /dev/ /media/ubuntu/dev
sudo mount --bind /dev/pts /media/ubuntu/dev/pts
sudo mount -o bind /etc/resolv.conf /media/ubuntu/etc/resolv.conf
sudo chroot /media/ubuntu
VISUAL=nano visudo

[/code]

[rburkartjo]

okay guys getting there not bad for a 60 year old fart here is where i am at if you could advise me how to proceed would appreciate it


ray@ray-desktop:~$ sudo apt-get update && sudo apt-get dist-upgrade
sudo: /etc/sudoers is mode 0640, should be 0440
Segmentation fault
ray@ray-desktop:~$

[sisco311]

okay guys getting there not bad for a 60 year old fart here is where i am at if you could advise me how to proceed would appreciate it


ray@ray-desktop:~$ sudo apt-get update && sudo apt-get dist-upgrade
sudo: /etc/sudoers is mode 0640, should be 0440
Segmentation fault
ray@ray-desktop:~$

You have to set the correct permissions on the sudoers file(Case 3 in the psychocats tutorial)

In the Recovery Mode run:

chmod 0440 /etc/sudoers

[rburkartjo]

sisco tks will try now

[rburkartjo]

no luck sisco any other ideas