To uninstall flowscan just follow these instructions.
/debian/stretch/main///install/index.html flow-based IP traffic analysis and visualization tool Debian 9.0 net 1.006-13.2
sudo apt-get remove flowscan
Which will remove just the flowscan package itself.
sudo apt-get remove --auto-remove flowscan
This will remove the flowscan package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for flowscan then this will work.
sudo apt-get purge flowscan
Or similarly, like this flowscan
sudo apt-get purge --auto-remove flowscan
|Description||flow-based IP traffic analysis and visualization tool|