Install Public Key To RPi-Monitor Repository:

sudo apt-get install dirmngr
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2C0D3C0F

Run The Following Command To Add RPi-Monitor To The Repository:

sudo wget http://goo.gl/vewCLL -O /etc/apt/sources.list.d/rpimonitor.list

Install RPI-Monitor:

sudo apt-get update
sudo apt-get install rpimonitor

After Install, Run The Following Command To Update Packages:

sudo /etc/init.d/rpimonitor update

Open Browser And Put In Pi IP Address And Port:

192.168.x.xxx:8888