If you want to uninstall all ntop packages (e.g. if you want to decommission a host or switch from dev to stable releases) you can uninstall all packages with a single command instead of removing individual packages as follows
curl -s https://raw.githubusercontent.com/ntop/packager/master/uninstall_all_ntop_packages.sh | sudo bash
Once this command is executed all ntop packages will be removed.