To uninstall apwal just follow these instructions.
/debian/stretch/main///install/index.html icon-based floating application launcher with transparency Debian 9.0 gnome 0.4.5-1.1
sudo apt-get remove apwal
Which will remove just the apwal package itself.
sudo apt-get remove --auto-remove apwal
This will remove the apwal package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for apwal then this will work.
sudo apt-get purge apwal
Or similarly, like this apwal
sudo apt-get purge --auto-remove apwal
|Maintainer||Sam Hocevar (Debian packages)
|Description||icon-based floating application launcher with transparency|