Nvidia-smi command not found for Jetson TX2 , Ubuntu 16.04

I am very new to using any such computing device,

I am receiving “bash: nvidia-smi: command not found” error message for “nvidia-smi” command.

and when I check nvcc version, “nvcc --version”. I am getting below output,

nvcc: NVIDIA ® Cuda compiler driver
Copyright © 2005-2017 NVIDIA Corporation
Built on Sun_Nov_19_03:16:56_CST_2017
Cuda compilation tools, release 9.0, V9.0.252

could someone let me know, what the issue is and how it can be resolved. Thank You.

nvidia-smi is part of the NVIDIA driver package, not part of the CUDA package. Try searching the file system for the binary, then add its location to PATH.

Thank You for the reply.
Actually, by the time I was trying to install latest version of python but some issue happened and now I am not able to access anything, whenever I login into nvidia account on system, It shows me blank screen and mouse is also shown as cross. I cannot open the terminal as well. Could you please suggest what could be the issue and how i can solve it.Please find the attached image