Best solution 
(1) Latest Piaware SD card image
Howto : Piaware SD card image 3.8.0 Quickstart Guide
Note:
Although the above howto is for ver 3.8.0, it is fully applicable to latest ver 3.8.1 also.
However the image download link given at start of the post is for old ver 3.8.0. Please dont it. Instead use this link for current image 3.8.1
(2) Graphs by Wiedehopf.
Use this bash script to install the graphs.
sudo bash -c "$(wget -q -O - https://raw.githubusercontent.com/wiedehopf/graphs1090/master/install.sh)"
To view graphs in browser:
IP-of-Pi/graphs1090