You can safely ignore this message.
You don't need the VT feature for Ubuntu. You only need the VT feature if you are wanting Ubuntu to act as a VM Server, ie to use it as a host for virtual machines (for example using KVM). If you are just wanting to use it as a regular server or even a virtual client you don't need to enable VT in your BIOS.
The message you are getting, I believe, comes from the Linux Kernel where parts of the code required for running KVM are disabled because your BIOS is not set to allow your processor to handle it.
If you are using GRUB to Boot into Windows or Ubuntu, you are not running Ubuntu in a VM. (When you are running a VM, you load 1 OS, then fire up a virtual server from that server. With Grub you are selecting which OS to use before the OS is loaded)