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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