My Light Has No Shadow Menu When I click on my light there is no shadow menu on the right as the image shows, I am wondering how do I get this menu back? I am currently running blender 2.8 on Linux. Thank you in advance for all your help.
You are using Cycles as your rendering engine. Only EEVEE has that shadow setting panel:



Things happen a lot between Cycles and EEVEE, beware of what engine are you using.