sudo password for users, not root

Oldy · 07-14-2020, 07:06 AM

I want change the root, but I still have the users (oldie). Example:

Code:

oldie@ubuntu:~$ sudo find / -name 'sudoers'
[sudo] password for oldie:

or

Code:

oldie@ubuntu:~$ sudo apt update
[sudo] password for oldie:

Can I change back to the root again, i.e. [sudo] password for root?

I have su. I had root and oldie before, but now it was broken. I don't know whats before, but I am relative newbie.

Code:

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

so I modified oldie ALL=(ALL) ALL in /etc/sudoers

I can not remove and add again users:

Code:

sudo killall -u oldie
sudo deluser --remove-home -f oldie
sudo adduser oldie

Ubuntu 20

Can you help me?

shruggy · 07-14-2020, 07:17 AM

The root user is locked by default on Ubuntu. How did it work previously? Had you enabled it with sudo passwd root?

pan64 · 07-14-2020, 07:45 AM

use su instead of sudo
or do you mean this: https://superuser.com/questions/1615...-root-password ?

Oldy · 07-14-2020, 08:42 AM

Almost there:

root: visudo /etc/sudoers

Code:

Defaults	env_reset
Defaults	mail_badpass
Defaults	secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
Defaults	rootpw
#Defaults   targetpw

root	ALL=(ALL:ALL) ALL
%admin ALL=(ALL) ALL
%sudo	ALL=(ALL:ALL) ALL
oldy ALL=(ALL) ALL

root: login (user/password)
oldy: exit (no user/pass)
root:

Can you tell me why there are no user and no password anymore on the command exit?

pan64 · 07-14-2020, 09:29 AM

do you mean when you exit a shell? Exiting a shell means you will stop the current process (shell) and return to the parent process. You need to use sudo to start a new shell/process with extra privileges, but you can always terminate it and return back where you were before.

Oldy · 07-14-2020, 12:18 PM

sudo reboot

Thanks alot.

pan64 · 07-14-2020, 12:45 PM

I do not really understand your question.

Oldy · 07-14-2020, 01:10 PM

I reboot it, of course user/pass.

Code:

ubuntu@login: oldy
password: _

Code:

oldy $: exit

, and starts again with user/pass.

Code:

oldy $: sudo apt update
[sudo] password for root: _

If you know what I mean

But nevermind.

pan64 · 07-14-2020, 01:16 PM

if I remember well sudo evaluates that sudoers file line by line. In your file Defaults rootpw comes first, so this line will be taken into account.
You do not need to reboot, the sudoers file will be effective immediately when you exit visudo.