For those who want to manually create desktop shortcut launcher in Ubuntu 16.04, Ubuntu 18.04, Ubuntu 19.04, Arronax is a good choice with graphical user interface.Other than creating .desktop file via Linux command, Arronax offers a graphical interface to create (and also edit) desktop shortcut for application, executable file, or URL.

Source: Arronax – Graphical Tool to Create Desktop Launcher in Ubuntu | UbuntuHandbook