I’m not sure dump978 works on jessie.
Easiest would be to rewrite the sd-card with the current image from flightaware and just copy over your piaware-config.txt. (save before writing the image)
Then put in your feeder-id and you should have everything installed and running again.
(For Beginners - How to Get Back Existing Station Number in A Fresh Install)
Alternatively you can try to install the missing packages:
sudo apt-get update
sudo apt-get upgrade
sudo apt install dump978-fa skyview978