KVM not working in Ubuntu guest machine

how do I locally snap build inside Ubuntu 1804 desktop running as guest machine inside windows 10.
because KVM does not run .

Check to see if there is an option for “nested hardware virtualisation” in the VM software you’re using. Without that, the virtual CPU Ubuntu is running on will not support KVM.

As an alternative, you could try building your snap using Snapcraft’s LXD support:

Instead of trying to launch a KVM virtual machine to perform the build on, it will instead use an LXD container. This does not rely on hardware virtualisation, so may be easier to get running in your environment.

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thank you
unfortunately virtual box does not support nested virtualization on intel processors. so will try lxd . thanks