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Try putting the .desktop file under Home  / .local / share / applications

The ".local" is a hidden file in your home directory, so press control + H

My .desktop looks like this ( I have saved the Left Application files into my Downloads Folder):

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Terminal=false
Exec=/home/halpin/Downloads/left/Left.sh
Name=Left
Icon=/home/halpin/Downloads/left/resources/app/icon.png

Yay! It works. Thank you.

Just a note for anyone else new to linux, be sure to add an ".sh" extension onto the "Left" file. Then just follow the guide in the link posted by jtimon, under the section for "Application directory".

Thanks for this post, it also helped me with launching the app (Still learning linux--I'm on Elementary). Not to take over the thread, but is there a way to create an alias to launch this?