This environment variable lives on in Windows 10 as a way to tell the system where to look when you try to run a command. Normally, the system looks in the Windows folder and its System32 subfolder.

Jack Wallen introduces you to Linux environment variables. What are they and how are they set and unset?

If the scenario is applicable, you can add the missing environment variable using the below methods. Method 1: Boot Windows in Safe Mode and use Advanced system settings ...