$ sudo apt-get remove ftp-proxy 

Uninstall ftp-proxy including dependent package

If you would like to remove ftp-proxy and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove ftp-proxy 

Use Purging ftp-proxy

If you use with purge options to ftp-proxy package all the configuration and dependent packages will be removed.

$ sudo apt-get purge ftp-proxy 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove ftp-proxy 

See Also,