I think you aren't doing anything wrong - it's just that the Ubuntu developers have moved an underlying library from python-xml package in order to avoid some import problems.

I'm currently following the install documentation.

I am having problems with

/usr/src/wikipbx# python manage.py syncdb

Error: Couldn't install apps, because there were errors in one or more models:
wikipbx.wikipbxweb: No module named ext

After some googling I found the following (which may or may not be significant.

https://launchpad.net/ubuntu/+source/python-xml/

python-xml (0.8.4-10.1ubuntu1) intrepid; urgency=low

* Merge from debian unstable, remaining changes: (LP: #????)
- Explicitely remove /usr/lib/python2.[345]/site-packages/_xmlplus,
likely be left by an earlier python-central version. LP: #212917.
- Install the files outside of sys.path, so that the package
does not overlay the xml code as found in the core python packages.
This package should be removed once all rdepends are gone. For
now, packages have to add this path before the first xml import:
sys.path.append('/usr/lib/python%s/site-packages/oldxml' %
sys.version[:3])

I am running on an ubuntu server.
/usr/src/wikipbx# cat /etc/debian_version
lenny/sid

Any ideas about what I need to do to get this going?

Cheers,

Darren