Question: how to enable vt-x is not available (verr_vmx_no_vmx)?
Answer: What is causing the vt-x is not available (verr_vmx_no_vmx) error.
Method 1: Disabling Hyper-V virtualization.
Method 2: Enable Nested virtualization from Avast Settings menu (if applicable)
Method 3: Disable Core isolation from Windows Defender.
Method 4: Enable VT-X from BIOS settings.