I have many times been asked off list if I found a fix.
For myself, I simply disabled the test for old files in /usr/bin/pycentral.
I commented out the following code
if found_old_base and found_base2:
raise PyCentralError, \
'shared files found in old (%s) and new locations
(%s)' % (old_shared_base, shared_base2)
But I might have a problem with the next update.
I think you will find more useful and debian standard suggestion in
the "Broken Upgrade Path for trac from etch-backports to lenny" thread
in the backports-us...@lists.backports.org
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