Mailing the story:
Set up Spicevmc Channel on Ubuntu 11.04 as KVM Server and spice-vdagent as a KVM guest
Procedure following bellow set up spicevmc channel support on KVM Server Ubuntu Natty. It also instructs how to setup spice-vdagent on Natty installed as KVM guest at any KVM Server Ubuntu 11.04 or F15. In other words it contains build debian package spice-vdagent via source for Ubuntu 11.04 ( Natty).