[Setup] Migrating from Windows to Linux

[Ben Lobo]

I'm trying to move all my existing Plone sites on Windows (Win2K, Plone
2.0.4, Zope 2.7.0) to Linux (Ubuntu 5.10, Plone 2.1-1, Zope 2.8.1-5).

1. Is it possible to export Plone sites from Win2k and import them into
Zope on Linux?

2. Assuming the answer to question 1 above is yes, do I have to upgrade
Plone on Win2k to version 2.1 and migrate all my sites to Plone 2.1 on
the Win2k server before I can import them into Zope 2.8.1/Plone 2.1 on
Linux?

I've tried importing a site directly from Zope 2.7.0 on the Win2k server
to Zope 2.8.1 on the Linux server and I get an error with the following
traceback:

-------------------------
Traceback (innermost last):
   Module ZPublisher.Publish, line 113, in publish
   Module ZPublisher.mapply, line 88, in mapply
   Module ZPublisher.Publish, line 40, in call_object
   Module OFS.ObjectManager, line 561, in manage_importObject
   Module OFS.ObjectManager, line 583, in _importObjectFromFile
   Module OFS.ObjectManager, line 293, in _setObject
   Module Products.CMFCore.CMFCatalogAware, line 186, in manage_afterAdd
   Module Products.CMFCore.CMFCatalogAware, line 222, in __recurse
   Module Products.CMFCore.CMFCatalogAware, line 185, in manage_afterAdd
   Module Products.CMFCore.CMFCatalogAware, line 50, in indexObject
   Module Products.CMFPlone.CatalogTool, line 404, in indexObject
   Module Products.CMFCore.CatalogTool, line 353, in reindexObject
   Module Products.CMFPlone.CatalogTool, line 425, in catalog_object
   Module Products.ZCatalog.ZCatalog, line 565, in catalog_object
   Module Products.ZCatalog.Catalog, line 361, in catalogObject
   Module Products.PluginIndexes.common.UnIndex, line 220, in index_object
   Module Products.PluginIndexes.common.UnIndex, line 247, in _index_object
   Module Products.PluginIndexes.common.UnIndex, line 205, in
insertForwardIndexEntry
AttributeError: _length
-------------------------

Any ideas?