Unable to boot – please use a kernel appropriate for your CPU.

今天用VirtualBox装了个ubuntu系统，正在装的时候就提示：

  This kernel requires the following features not present on theCPU:
    Unable to boot – please use akernel appropriate for your CPU.


选中对应的虚拟系统——设置——系统——处理器——扩展特性------启用 PAE/NX！