Fixing Sudoer

Linux Support
1

I am currently trying to fix sudoer after making some changes it seems i killed the sudoer list.

OS/ unbuntu 12.04

error/ sudo: must be setuid root

Guessing this happened when i made some permission changes to usr/bin

I have tried the following so far.

booted in to recovery mode

remounted the drive to read write using
mount -o rw,remount /

readded my user as sudo using

adduser makin sudo

replaced the sudo file with the backup and then edited it to confirm all info is correct.

sudo cp /etc/sudoers /etc/sudoers.backup
sudo nano /etc/sudoers

I have confirmed using that the user account is sudo upon logging back in to the user account using the following:

id makin

response output was as follows:

uid=1000(main) gid=1000(makin) groups=1000(makin),4(adm),20(dialout),24(cdrom),27(sudo),46(plugdev),116(lpadmin),118(admin),124(sambashare)

still getting this error after running through all of this.
note: this was done as root access as i do have the root password for this box.

Once again any help appreciated guys, thankyou in advance for your time.

Cheers Makin

2

Question:
What are you doing when that error crops up?
Is it on every use of ‘sudo’ ?

Try fixing the ownership and access rights:

chwon root:root /usr/bin/sudo

then

chmod 4755 /usr/bin/sudo

then reboot and see if makes any diference

3

Yes this was occuring on every time trying to use Sudo, guess it started when i changed the permissions to usr/bin.

I have now reinstalled using usb install i created and set to keep my files and ove3rwrite the system files to resolve the issue as i had tried the options you mentioned and it didnt seem to resolve the issue.

appreciate your help though.

Kicks himself for not setting up the backup feature.