Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Okay, so this is embarrassing, but I seem to have lost the admin group on my machine, though I would have sworn I hadn't gone anywhere near it. I'm running Mint Maya.

Trying to innocently sudo this morning (toupdate-alternatives) I got the response:

kate is not in the sudoers file.  This incident will be reported.

I can get to a root shell from the boot menu, thankfully, and /etc/sudoers looks fine, but it refers to admin and /etc/group doesn't contain it. (I can only assume it used to; I never had any problem with sudo before today.) Trying to recreate an admin group with groupadd admin (as root) gives me this:

groupadd: cannot lock /etc/group; try again later.

I can't find any .lock files in /etc, and I've run out of Google leads, so I'm really at a loss.

UPDATE: The locking issue may be because the boot root shell is read-only.

share|improve this question
    
Try mount -w -o remount / to get the root filesystem out of readonly mode –  Alan Curry Aug 31 '12 at 23:54
    
I've just tried the fsck recovery boot menu option which seemed to do just that, getting it out of readonly mode. Thank you. phew! –  Kate McKenzie Sep 1 '12 at 0:15
add comment

1 Answer

Running fsck first mounted / in read/write mode, which allowed me to groupadd admin, usermod -a -G admim myself, and regain sudo privileges.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.