Do we need to reboot after adding an user to

  • Have you tried running sudo before rebooting? – kos Aug 27 '15 at 10:05
  • @kos have you down voted according to your comment ? if yes then you got my question wrongly. – Ashish Karpe Jan 12 '17 at 11:46

No. It'll work with the next sudo command.

But if it does not work, you can avoid rebooting by running

sudo service sudo restart
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    On my 14.04 system it did not work with the next sudo command. I needed to do sudo service sudo restart (Rebooting would have worked too, I guess. Bit overkill though.) – Nick Rice Jun 2 '18 at 6:32
  • Failed to restart sudo.service: Unit sudo.service is masked.? – Xerus Nov 13 at 11:41

I just did this and yes, I did in fact have to reboot. So, maybe the previous answer wasn't wrong, but it definitely isn't right 100% of the time. Writing this in case someone else is looking for the answer as I just was.

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    I had to reboot as well. – Nadav B Feb 12 '18 at 10:12
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    Instead of rebooting you can do sudo service sudo restart – Nick Rice Jun 2 '18 at 6:32
  • @NickRice any idea on what to do in Arch Linux? – Necktwi Aug 5 '18 at 3:50
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    What if $sudo service sudo restart outputs 'Failed to restart sudo.service: Unit sudo.service is masked.' – user2066480 Aug 2 '19 at 12:31

In CentOS 7 you can also Logout from the system with "exit" and Login again and the Sudoers will be updated.

I've tested on minimal installation but I believe it works in other targets and possibly other distributions aswell.

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In fact the only thing you need is to get a (new) login prompt, so using the following command works:

anyuser$ su -l <user>
user$ sudo <thenewlysudoedcommand>
... works...

But if you are logged in as GUI, then you need to logout & login again.

But, as with MOST linux tools you DON'T need to reboot the computer (that's a Windows thing).

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