1K64t7k5FafRqbXF7MfySJHMGkJJust use the following syntax:
sudo apt-get remove {package-name}

For example remove package called mplayer, enter:
$ sudo apt-get remove mplayer

Remove package called lighttpd along with all configuration files, enter:
$ sudo apt-get --purge remove lighttpd

list all installed package, enter:\
dpkg --list
dpkg --list | less
dpkg --list | grep -i 'http