sudo chown [username] -hR /

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

chown -R root:root /usr/bin/sudo
chmod -R a=rx,u+ws /usr/bin/sudo
chown -R root:root /usr/lib/sudo/sudoer.so
chmod -R a=rx,u+ws /usr/lib/sudo/sudoer.so

autologin-user=root
greeter-show-manual-login=true

chown root:root /usr/bin/sudo && chmod 4755 /usr/bin/sudo

vi /etc/lightdm/lightdm.conf

autologin-user=root
greeter-show-manual-login=true

chown root:root /usr/bin/sudo && chmod 4755 /usr/bin/sudo