Which Process Running on What Port

http://www.debian-administration.org/articles/184

To see all the ports open for listening upon the current host you can use another command netstat (contained in the net-tools package):

root@mystery:~# netstat -a |grep LISTEN |grep -v unix

Which process is bound to port 80

lsof -i :80

Installed Packages and Locations?

What is installed ?

       $ dpkg --get-selections

       or

       $ dpkg --list  

       or

       $ dpkg --list | grep -i 'gradle'

Location installed ?
       $ dpkg -L gradle

To Remove ?
       $ sudo apt-get --purge remove lighttpd