If you are upgrading, then better upgrade to Stretch, and not to Buster. The dump978-fa may have dependency issues on Buster.
EDIT:
Noted that you have Piaware SD card image. The current Piaware image is Stretch based. Cleanest and easiest option is to re-image with latest Piaware SD card image. It has both dump1090-fa and dump978-fa.
Piaware SD card image 3.7.1 Quickstart Guide
Note: do not download and use ver 3.7.1 image as mentioned in the guide (it was written before 3.7.2 was released). Use the latest version 3.7.2. The guide holds good for ver 3.7.2 also.