package is uninstallable due to some dependencies being missing

13:51:16 - flash:[~/source-trees/hwdb-scripts] sudo apt-get install python-zope.app.pagetemplate
[sudo] password for bdmurray:
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:
  python-zope.app.pagetemplate: Depends: python-zope.pagetemplate but it is not installable
                                Depends: python-zope.dublincore but it is not going to be installed
                                Depends: python-zope.browserpage but it is not going to be installed

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: python-zope.app.pagetemplate (not installed)
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic x86_64
Architecture: amd64
CheckboxSubmission: fee5e196cb921cbd36888f428b38b488
CheckboxSystem: 2a6f54df59af338184485e85cbcf0d32
Date: Tue Apr 13 13:52:47 2010
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: zope.app.pagetemplate