I know that I can change desktops by either clicking on their icon or rolling the mousewheel while holding Alt.
I'm wondering if there's a pure keyboard shortcut for switching between desktops.
Reference: Lubuntu/Keyboard
In Lubuntu 16.04 LTS the following default shortcuts switch directly to a certain desktop:
~/.config/openbox/lubuntu-rc.xml
to see all the shortcuts available for keyboard and mouse.