root allow ( ssh & login ) for ubuntu

os : 3.16.0-30-generic #40~14.04.1-Ubuntu SMP

musesoft@musesoft-IdeaPad-S215:~$ sudo passwd root
[sudo] password for musesoft:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

musesoft@musesoft-IdeaPad-S215:~$ su
Password:
root@musesoft-IdeaPad-S215:/home/musesoft#

root@musesoft-IdeaPad-S215:/home/musesoft# vim /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

[SeatDefaults]
user-session=ubuntu
greeter-show-manual-login=ture

root@musesoft-IdeaPad-S215:/home/musesoft# vi /etc/ssh/sshd_config
#PermitRootLogin without-password
PermitRootLogin yes

shutdown -r now