Is a virtual kernel for ubuntu 12.10

Hi All:

I have installed ubuntu 12.04 on xenserver, and I installed the virtual-kernel for 12.04, it will also install linux-image-3.2.0-24-virtual, linux-headers-3.2.0-24-virtual. After reboot, the command "uname -a " will tell you it runs with the kernel "ubuntu-12 3.2.0-24-virtual".
But when I install ubuntu 12.10 on xenserver, the virtual-kernel for it does not install any linux-image-3.5.x-virtual, and after reboot, the command "uname -a " will tell you it runs with the kernel "3.5.0-17-generic".
Can any one tell me why?
Is it changed in ubuntu 12.10?
Or there is not a virtual kernel for 12.10 yet?
Thank you for your reply and welcome to discuss the issue.