While creating Desktop shortcut in Ubuntu 18.04 and 16.04, You can give name, icon and location where you launch file is.
To create shortcut in Ubuntu 18.04 and 16.04, you require gnome-panel package.
You can install gnome package using below command if not installed already:
sudo apt-get install --no-install-recommends gnome-panel
After installation is done, type below command
gnome-desktop-item-edit ~/Desktop/ --create-new
A Popup will appear which is attached in image, Give following details
Name: Name of your shortcut
Location: Where your launch file is
Icon: Click on image on top left corner. You can also do it by clicking on arrow on the desktop icon and choose the icon you like.