Thanks for following up. I'm closing this report due to your last comment.
Don't hesitate to submit any new bug.
** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
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System broken on Jaunty to Koala Upgrade by python
https://bugs.launchpad.net/bugs/473450
You received
The problem occurred because during upgrade of the python-minimal
package, it attempted to copy the '/usr/lib/python2.6/site-packages'
folder to some other location with the name 'old-site-packages'. The
'old-site-packages' did not exist. It seems that I had a site-packages
folder under /usr/lib/py
