Ubuntu 18.04 Application and Favourite Icon Location
Ubuntu 18.04 Application Icons are stored in "/usr/share/applications/[app].desktop"
They are accessed with the Show Application icons
in the bottom lefthand cornsr of the desktop screen.
The applications that are flagged as Favourites are stored in the dconf database file, ~/.config/dconf/user
Ubuntu 18.04 traditional Desktop Icons are stored in ~/.local/share/applications
Manipulating the dconf database
This artice give examples on how to use the gsetings commnad.
The key you want is favorite-apps, the schema ID is org.gnome.shell. Now to list your favorite apps you can simply run
Glenn Lyons VK4PK
Ver:gnl15092018 - pre published v0.9