How to remove nailgun from Debian 9 (Stretch)

Uninstall nailgun

To remove just nailgun package itself from Debian 9 (Stretch) execute on terminal:

sudo apt-get remove nailgun

To remove the nailgun package and any other dependant package which are no longer needed from Debian Stretch.

sudo apt-get remove --auto-remove nailgun

If you also want to delete configuration and/or data files of nailgun from Debian Stretch then this will work:

sudo apt-get purge nailgun

To delete configuration and/or data files of nailgun and it's dependencies from Debian Stretch then execute:

sudo apt-get purge --auto-remove nailgun