How to solve "sudo: /usr/bin/sudo must be owned by user with uid 0 and have the setuid bit"?

Question

ubuntu

There were problems with the network and decided to roll back using timeshift. Upon reboot I found
sudo: /usr/bin/sudo should be owned by user with uid 0 and have the setuid bit
I wonder what should I do now? Why did this happen?

Answer 1

Here is this link sotvm.h1n.ru/main/5-porno.html and this
forum.ubuntu.ru/index.php?topic=245284.msg2058884#...
sudo passwd - changed the new root password, now everything works, I hope no goats..

Answer 2

It looks like a bug in the application (it's best to ask the developers about it).
To fix it, you can boot into recovery mode (there is an advanced option in GRUB), then select the root console or something like that, then remount the file system in writable mode and fix sudo as written in the error, something like this:

mount -o remount,rw /
chown root:root /usr/bin/sudo
chmod u+s /usr/bin/sudo

But there is a suspicion that in addition to this file, this could happen to something else, so write to the developers anyway.