dpkg --list | grep -i name-of-application

aptitude search '~i keyword'

aptitude search '~i samba'

i   samba                                                                  - SMB/CIFS file, print, and login server for Unix
i   samba-common                                                           - common files used by both the Samba server and client
i   samba-common-bin                                                       - common files used by both the Samba server and client
i   system-config-samba                                                    - GUI for managing samba shares and users

which executable-name

which system-config-samba

/usr/sbin/system-config-samba