Comment 1 for bug 839492

Thank you for taking the time to report this bug and helping to make Ubuntu better. Unfortunately this package was removed from Debian and Ubuntu because it was "obsolete, unsupported" and therefore I'm marking this as Invalid since I can't mark as Won't Fix.

xen-tools is only supported in Ubuntu 8.04.2 LTS for servers and (in the future) Ubuntu 11.10 release.