follow this step:
!- sudo apt-get install lsb-release scrot
2- wget
3- sudo dpkg -i archey-0.2.8.deb

How to add it to start up of every shell you open.
sudo nano /home/YOUR_USER_NAME/.bashrc
Go down to the bottom of the file and add either archey or screenfetch
Press ctrl+x hit y to save and enter to confirm.