fresh zop2.10 instance does not start

Binary package hint: zope2.10

./zopectl start only produces the error:

AttributeError: 'module' object has no attribute 'CAPI'

I ecpected the fresh instance to start and liten on an tcp port.

environment: on an Ubuntu 8.04.1 x86 server (with all available updates) I just installed:

zope2.10 2.10.5-2
zope-common 0.5.38
zope-tinytableplus 0.9-18
zope-zwiki 0.60.0-1

and called mkzopeinstance.py
and edited the log file location in instancehome/etc/zope.conf
to /var/log/zope/* and chowned that dir to user zope

as a last big paragraph: the complete python exception output:

root@instancehome/bin ./zopectl start
Traceback (most recent call last):
  File "/usr/lib/zope2.10/lib/python/Zope2/Startup/zopectl.py", line 329, in ?
    main()
  File "/usr/lib/zope2.10/lib/python/Zope2/Startup/zopectl.py", line 287, in main
    options.realize(args)
  File "/usr/lib/zope2.10/lib/python/Zope2/Startup/zopectl.py", line 95, in realize
    ZDOptions.realize(self, *args, **kw)
  File "/usr/lib/zope2.10/lib/python/zdaemon/zdoptions.py", line 273, in realize
    self.load_schema()
  File "/usr/lib/zope2.10/lib/python/zdaemon/zdoptions.py", line 321, in load_schema
    self.schema = ZConfig.loadSchema(self.schemafile)
  File "/usr/lib/zope2.10/lib/python/ZConfig/loader.py", line 31, in loadSchema
    return SchemaLoader().loadURL(url)
  File "/usr/lib/zope2.10/lib/python/ZConfig/loader.py", line 65, in loadURL
    return self.loadResource(r)
  File "/usr/lib/zope2.10/lib/python/ZConfig/loader.py", line 159, in loadResource
    schema = ZConfig.schema.parseResource(resource, self)
  File "/usr/lib/zope2.10/lib/python/ZConfig/schema.py", line 27, in parseResource
    xml.sax.parse(resource.file, parser)
  File "/usr/lib/python2.4/xml/sax/__init__.py", line 33, in parse
    parser.parse(source)
  File "/usr/lib/python2.4/xml/sax/expatreader.py", line 107, in parse
    xmlreader.IncrementalParser.parse(self, source)
  File "/usr/lib/python2.4/xml/sax/xmlreader.py", line 123, in parse
    self.feed(buffer)
  File "/usr/lib/python2.4/xml/sax/expatreader.py", line 207, in feed
    self._parser.Parse(data, isFinal)
  File "/usr/lib/python2.4/xml/sax/expatreader.py", line 300, in start_element
    self._cont_handler.startElement(name, AttributesImpl(attrs))
  File "/usr/lib/zope2.10/lib/python/ZConfig/schema.py", line 99, in startElement
    getattr(self, "start_" + name)(attrs)
  File "/usr/lib/zope2.10/lib/python/ZConfig/schema.py", line 475, in start_schema
    keytype, valuetype, datatype = self.get_sect_typeinfo(attrs)
  File "/usr/lib/zope2.10/lib/python/ZConfig/schema.py", line 201, in get_sect_typeinfo
    datatype = self.get_datatype(attrs, "datatype", "null", base)
  File "/usr/lib/zope2.10/lib/python/ZConfig/schema.py", line 194, in get_datatype
    return self._registry.get(dtname)
  File "/usr/lib/zope2.10/lib/python/ZConfig/datatypes.py", line 398, in get
    t = self.search(name)
  File "/usr/lib/zope2.10/lib/python/ZConfig/datatypes.py", line 423, in search
    package = __import__(n, g, g, component)
  File "/usr/lib/zope2.10/lib/python/Zope2/Startup/datatypes.py", line 21, in ?
    import OFS.Uninstalled
  File "/usr/lib/zope2.10/lib/python/OFS/Uninstalled.py", line 16, in ?
    import SimpleItem, Globals, Acquisition
  File "/usr/lib/zope2.10/lib/python/OFS/SimpleItem.py", line 26, in ?
    import AccessControl.Role, AccessControl.Owned, App.Common
  File "/usr/lib/zope2.10/lib/python/AccessControl/__init__.py", line 17, in ?
    from Implementation import setImplementation
  File "/usr/lib/zope2.10/lib/python/AccessControl/Implementation.py", line 98, in ?
    setImplementation("C")
  File "/usr/lib/zope2.10/lib/python/AccessControl/Implementation.py", line 51, in setImplementation
    from AccessControl import ImplC as impl
  File "/usr/lib/zope2.10/lib/python/AccessControl/ImplC.py", line 18, in ?
    from cAccessControl import rolesForPermissionOn, \
  File "/usr/lib/zope2.10/lib/python/AccessControl/SimpleObjectPolicies.py", line 111, in ?
    from BTrees.OOBTree import OOBTree, OOBucket, OOSet
  File "/net/projects/web/zope/lib/python/BTrees/__init__.py", line 11, in ?
    import Interfaces
  File "/net/projects/web/zope/lib/python/BTrees/Interfaces.py", line 15, in ?
    import OOBTree, Interface
  File "/net/projects/web/zope/lib/python/BTrees/OOBTree.py", line 16, in ?
    from _OOBTree import *
AttributeError: 'module' object has no attribute 'CAPI'