• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 744
  • Last Modified:

Ubuntu Lost Sudoer

Hi

I am running Ubuntu 10.10. I have only one user which was able to Sudo few hours back. I made a new group abc and mistakenly ran the this statement

usermod -G abc myuser

I then logged out. Now I am not able to sudo.

When I sudo Linux says "myuser is not in the sudoers file.  This incident will be reported"

Is there any solution?
0
systemsautomation
Asked:
systemsautomation
2 Solutions
 
Ernie BeekExpertCommented:
Can you still log on as root (from the terminal)?

Then try this:

echo 'myuser ALL=(ALL) ALL' >> /etc/sudoers

But be SHURE to put in >> (two >'s , whatever they are called) otherwise there might be some unexpected effects :-~
0
 
Ernie BeekExpertCommented:
Offcourse I meant: SURE

0
 
systemsautomationAuthor Commented:
No. I cannot login as root. It says "Login Incorrect"
0
NEW Internet Security Report Now Available!

WatchGuard’s Threat Lab is a group of dedicated threat researchers committed to helping you stay ahead of the bad guys by providing in-depth analysis of the top security threats to your network.  Check out this quarters report on the threats that shook the industry in Q4 2017.

 
woolmilkporcCommented:
Hi,

this should help you: http://www.psychocats.net/ubuntu/resetpassword

Basically, you will have to enter recovery (or "rescue") mode (that's described in the link) to go to the root shell prompt. The rest of the article above deals with resetting your own password, which is not of relevance here.

Once you're in the root shell you can revert the effects of your usermod command or you can customize sudoers using "visudo" to either add the "abc" group with same settings as the "admin" group, or to add "myuser" with the settings of the "admin" group.

wmp
0
 
brb6708Commented:
very easy:

boot from ubuntu live cd

open a terminal and enter

sudo su
mkdir /rootdisk
mount /dev/<device> /rootdisk

if you do not know which device contains your rootfolder you can enter "fdisk -l" to see which devices are available and try the right one.

use a editor to edit /rootdisk/etc/group and find the line "admin:122:<user>" (122 is maybe different - important is admin:xxxx)

just write the login names of all users that should have sudo rights like
admin:122:user1,user2

then reboot your computer and you should be able get sudo rights again.
0
 
systemsautomationAuthor Commented:
Thanks
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now