Comment 22 for bug 349837

workaround that did it for me:

# 1.
downgrade to intrepid

#2.
install calendarsever

#3.
upgrade to current release, karmic in my case

it might be dirty but hey? No offense,but this seems to take a little longer.
python-xml seems to be the culprit. Is it true that this packages was updated
in 2004-11-29 the last time?
http://sourceforge.net/projects/pyxml/files/

regards
john