If you want Cubbit Desktop to start automatically when you boot Linux we need to create a cubbit.desktop file inside ~/.config/autostart/.
To do this you first need to verify that the folder ~/.config/autostart exists and create it if it doesn’t.
Then open a text editor and copy & paste the following:
[Desktop Entry]
Type=Application
Version=1.0
Name=Cubbit
Exec=/home/username/Downloads/Cubbit.AppImage --no-sandbox
You only have to change the Exec field to the correct path and save the file as cubbit.desktop.