By default the root ssh login to Ubuntu 14.04 Linux server is disable. This is a security feature and even though you chnage the root password the root ssh login will be denied showing message similar to the one below:
$ ssh This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Permission denied, please try again.
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Permission denied, please try again.
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Permission denied (publickey,password).
In order to allow a root SSH login on Ubuntu 14.01 Linux server/desktop the sshd daemon's config file /etc/ssh/sshd_config needs to be changed. Open /etc/ssh/sshd_config and make a following changes to the line specified below:
FROM:
PermitRootLogin without-password
TO:
PermitRootLogin yes
Once you have made the change, restart the SSHD service for those changes to take affect:
# service ssh restart
ssh stop/waiting
ssh start/running, process 6919
Once done you can SSH login to ubuntu server:
$ ssh This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.'s password: 
Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.0-24-generic x86_64)