sudo: must be setuid root solved in Ubuntu

sudo: must be setuid root solved in Ubuntu

Press ‘shift’ to go to recovery console of Ubuntu while system starts.

Image-I

Use drop down key to select root as per the image -I then press enter

Type – mount -o rw,remount / 

Press enter

Type – chown root:root /usr/bin/sudo

Press enter

Type – chmod 4755 /usr/bin/sudo

Press enter

Type – shutdown -r now 

Press enter to Reboot