To uninstall aircrack-ng just follow these instructions.
sudo apt-get remove aircrack-ng
This will remove just the aircrack-ng package itself.
sudo apt-get remove --auto-remove aircrack-ng
This will remove the aircrack-ng package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for aircrack-ng then this will work.
sudo apt-get purge aircrack-ng
Or similarly, like this aircrack-ng
sudo apt-get purge --auto-remove aircrack-ng
|Maintainer||Debian Security Tools Packaging Team <email@example.com>|
|Description||wireless WEP/WPA cracking utilities|