Login Loop With Ubuntu

Hello,
I’m using kit Nvidia Jetson Tx2 on Ubuntu 16.04
Few days ago, my desktop lost all taskbar. After I try reset my kit and when I access with default password.
But my program login loop…
When I write with wrong pass, desktop show “invalid password, please try again”.
Can you help me?
Thank you

Duplicate thread. Original here:
https://devtalk.nvidia.com/default/topic/1043841/jetson-tx2/can-not-access-in-ubuntu/