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

Question

By mistake I entered the command

sudo chmod -R 777 somefolder ./ 

Now I am unable to log in to my system as root user. I have the login loop problem

Solution

Hi i had a similar problem and this is how i solved it.

• First reboot your machine and enter the recovery mode from your grub menu
• Choose the drop to root shell option.This will prompt you with a control-D to continue just press enter

• You are now in a root shell.Do the following

  mount -o remount,rw /
  chown root:root /usr/bin/sudo
  chmod 4755 /usr/bin/sudo
  exit

• Go back to the menu and choose resume normal boot

Comments

[Zanna]

Why would you want to log in as root? What directory were you in when you ran the command? If you have the error in your title, I guess you must have run it at least on /usr if not on /. Fixing recursive chmod is a pain... If you want the least hassle, get your data off there with a live USB and reinstall

[muru]

Possible duplicate of What if I accidentally run command "chmod -R" on system directories (/, /etc, ...)