Hi Randy, I’m not sure if you ever use the Search function of this forum, the Magnifying glass/Loupe symbol top right of the menu bar, next to your Avatar and the burger menu, but a lot of your questions may be answered that way. Give that a go too, as well as asking on here, or maybe before.
Its always worth a look and check out different ways of asking the question. I just tried a few ways and came up with these.
and this one, this is the one I used before when I installed mine on Linux.
now this link leads you too:
and the bit of this you want is here
Its part 6
and goes like this
6:) Type in terminal:
cd ~
cd /opt
sudo mkdir Pinegrow
cd Pinegrow
mv ~/Downloads/3.0 .
Cd 3.0
sudo nano Pinegrow.desktop
Copy and paste code in the example file ( Same location shared on Google drive link ) into the Pinegrow.desktop file
[Desktop Entry]
Name=Pinegrow
GenericName=HTML Editor
Comment=Create Awesome Websites with Pinegrow
Exec=sh -c "/opt/Pinegrow/3.0/PinegrowLibrary"
Icon=/opt/Pinegrow/3.0/pinegrow.png
Terminal=false
Type=Application
*Make sure to not add it, but let it be the only lines in the file
press CTRL+o to save file.
press Enter to save as default listed name (Pinegrow.desktop)
press CTRL+x on keyboard to exit and go back to command prompt
sudo mv Pinegrow.desktop /usr/share/applications
Make sure you just do that in relation to what you have already done, the stuff before point 6 might well not be relevant to you, and change version numbers and location of your installed Pinegrow etc.
And, there didn’t USED to be an actual icon.svg file in the ubuntu installer.
IT might well be worth the Pinegrow Devs putting up some instruction for installing PineGrow on Linux and getting the quick launch icon to work. Or maybe I too have missed those docs 
I hope that helps and check out the search function, I check it out every now and again, I find some good stuff.
Also, our current docs don’t really show up A LOT of stuff.
SO ALWAYS check out the older docs.