How can I solve this error : sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set


I did a stupid thing, on my Ubuntu 16.04 Droplet, I gave a chmod -R 777 * command on /usr folder. I wanted to restart my Nginx server, but it gave me an error (of course) :

sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

And I can not access sudo su - root.

How can I reverse all that?

Thanks you for your answers.

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You can chmod u+s /usr/bin/sudo Though you’ll need to actually log as root, if you can’t sudo right now.

I don’t know of any way of automatically restoring all the permissions on the rest of the files.

Muchas gracias excelente aporte.

@albimaan In the first step SHIFT key do not work for dell-Vostro-3491. esc key should be pressed after restart.