The error 'Unity is not supported in this guest operating system' typically occurs when you're trying to use Unity 3D game engine on a virtual machine (VM) or an unsupported platform. Unity has specific system requirements and doesn't support all types of operating systems or platforms.
Two major reasons for this error are:
To resolve the error 'Unity is not supported in this guest operating system', consider the following solutions:
Run Unity on a Supported System: Ensure that you install and run Unity on a system with an operating system that is supported by Unity. For example, a physical machine running on a recent version of Windows, macOS, or a supported Linux distribution.
Avoid Virtual Machines: If possible, avoid running Unity within a virtual machine. While it may be technically possible to get Unity working inside a VM, performance may be substandard, and certain features may not work at all.
Update Operating System: If you are using a supported OS but it's an outdated version, try updating your OS to a version that is supported by the Unity version you're using.