When install unity8 it's just stop on configuring unity8 LXC

Help me,
I want to Install Unity 8 LXC on my Ubuntu 15.04
But when I unpakcing the ISO it's just stop on
'Configuring the Unity8 LXC'
'Dell @ <my laptop type>: ~ $'
and then did not continue the process again. Anybody can help me?
BUt when I go to LightDM Login Screen, there is a choice of 8 LXC Unity, but when I choose it and log in with it, it will only be a blank desktop with the mouse and then back to the login screen using Unity 8 LXC but I can not type the password or move my mouse.
Pls Help me, I am new so I don't understand it properly..