Check if CPU can virtualize (can it returns any results)

egrep '(vmx|svm)' --color=always /proc/cpuinfo
 

Check if you have a 64 CPU (is if it returns any results)

grep ' lm ' /proc/cpuinfo
 

Check if your running a 64 bit kernel

uname -m
 

Install

sudo apt-get install kvm libvirt-bin ubuntu-vm-builder qemu bridge-utils virt-viewer
 

Add user (must be normal user when run this command)

sudo adduser `id -un` libvirtd
 

Now must logout, and back in, or possibly reboot

Check if worked

virsh -c qemu:///system list
 

Make the Machine from your OS .iso

sudo virt-install --connect qemu:///system -n vista -r 1024 -f /home/Storage/kvm/machines/vista.qcow2 -s 20 -c /media/qserver/installers/Windows/OS/Windows\ Vista\ Ultimate\ SP1.iso --vnc --noautoconsole --os-type windows --os-variant vista
 

Start up the newly created machine

sudo apt-get install virt-viewer
virt-viewer -c qemu:///system vista
 

And vista installer popped up!

When I came back the next morning, the vista windows was closed (probably because of the vista installer reboot) So I ran the virt-viewer command above again, but it did not work, I got an error

unable to find vnc graphics for vista

Also tryed

qemu /home/Storage/kvm/machines/vista.qcow2
 

Which did popup vista and start loading, even got the splash screen, but kept blue screening, and rebooting quicly. Tried save mode too, did not work.

Finally I

apt-get install virt-manager
virt-manager
 

It opened, it's a nice gui, there was my vista setup, I click run, and it started running, but no display (supposed to run in background). I right-clicked on vista and clicked open, and there it was again. I guess my settings for virt-viewer are wrong.

Read if you have virtualbox installed too, you may run into kernel module issues
http://ubuntu-tutorials.com/2008/06/08/kvm-and-virt-manager-on-ubuntu-804/
So to remove virtualbox module

sudo modprobe -r vboxdrv
 

Or to remove kvm modules (there is kvm-amd which is mine, kvm-intel, and just kvm)

sudo modprobe -r kvm-amd
 

And a few minutes later if found my HD

Check this, my ubuntu install, with compiz of course, running tons of programs, including Windows XP in a VirtualBox virtual machine, and installing Windows Vista in a KVM qemu Virtual Machine, heck yeah!!

Wow, I have a Athlon X2, 2.0Ghz with 4GB ddr2 800 and I have it maxed.
Currently, have 6 terminals open, firefox with about 50 tabs, gnome-system-monitor, VirtualBox running Windows XP and playing a 700MB .avi movie in media player, KMV virtual machine installing windows vista to same disk as root partition, and you can see my CPU is maxed out!