Similar questions have been asked about this here but I tried them to no avail. I suspect what used to work in the past have not been working in the latest versions of Ubuntu. I am using Ubuntu Xenial 16.04.

I have tried the following:


pico /etc/polkit-1/50-local.d/disable-shutdown.pkla

Then fill the file with:

[Disable shutdown/restart etc. for users]


chmod o-x /sbin/shutdown
chmod o-x /sbin/reboot

These methods didn't work for me. I could still reboot the server with a non-root account after entering the password:

 sudo reboot

EDIT: With xxx's account:

sudo -l


Matching Defaults entries for xxx on scw-415fa7:
    env_reset, mail_badpass,

User xxx may run the following commands on scw-415fa7:
    (ALL : ALL) ALL


sudo grep xxx /etc/sudoers* -R


/etc/sudoers:xxx ALL=(ALL:ALL) ALL
  • 1
    sudo reboot runs reboot as root. That's the whole point of sudo. Why give users sudo privileges if you don't want them to run commands as root? – muru Dec 26 '17 at 5:47
  • Alright. Now I see the problem. Could you also please tell me how to take away sudo privileges from non-root users? – Chong Lip Phang Dec 26 '17 at 5:52
  • How did you give it to them in the first place? – muru Dec 26 '17 at 5:53
  • I think this will answer my question: askubuntu.com/questions/335987/… – Chong Lip Phang Dec 26 '17 at 5:54
  • Hey...sudo deluser xxx sudo...didn't work. It said: The user xxx' is not a member of group sudo'. I think I added the user with this command: adduser xxx. – Chong Lip Phang Dec 26 '17 at 5:58

I think I have solved my problem with this on the root account:


Then comment out this line:

| improve this answer | |

If you want to give access to only root, you can do:

chmod 700 /sbin/reboot
chmod 700 /sbin/shutdown
| improve this answer | |

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