ubuntu-xen-server has broken dependencies

[Fridtjof Busse]

On current lucid x86_64:

$ LANG=C sudo apt-get install ubuntu-xen-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  ubuntu-xen-server: Depends: xen-tools but it is not installable
E: Broken packages

$ LANG=C sudo apt-get install xen-tools
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package xen-tools is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package xen-tools has no installation candidate

ProblemType: Bug
Architecture: amd64
Date: Wed Mar 17 09:57:34 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu-Server 10.04 "Lucid Lynx" - Alpha amd64 (20100224.1)
Package: ubuntu-xen-server (not installed)
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-server
SourcePackage: xen-meta
Uname: Linux 2.6.32-16-server x86_64

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.