Ubuntu 14.04 GUI root login

1) sudo passwd root

2) vi /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

3) add this line:
greeter-show-manual-login=true

4) vi /root/.profile

#mesg n #replace it. check `. instead of '.

if `tty -s`; then
   mesg n
fi