[Mailman-Users] Configuration script bails

[Douglas Phillipson]

Installed on Debian Testing, mailman updates fail, causing other 
packages to fail to install with the following output, any help would be 
greatly appreciated...

Doug P

apt-get install mailman
Reading package lists... Done
Building dependency tree... Done
mailman is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 109 not upgraded.
1 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
Setting up mailman (2.1.9-7) ...
Looking for enabled languages (this may take some time) ... done.
Installing site language en ............................................ 
done.
No updates are necessary.
Traceback (most recent call last):
   File "/var/lib/mailman/bin/withlist", line 297, in ?
     main()
   File "/var/lib/mailman/bin/withlist", line 272, in main
     r = [do_list(listname, args, func) for listname in Utils.list_names()]
   File "/var/lib/mailman/bin/withlist", line 201, in do_list
     return func(m, *args)
   File "/usr/lib/mailman/bin/unicodify_archives.py", line 59, in 
unicodify_archives
     h.database.mapKeys(unicodify_fst, archive, hdr)
   File "/var/lib/mailman/Mailman/Archiver/HyperDatabase.py", line 341, 
in mapKeys
     self.__openIndices(archive)
   File "/var/lib/mailman/Mailman/Archiver/HyperDatabase.py", line 251, 
in __openIndices
     t = DumbBTree(os.path.join(arcdir, archive + '-' + i))
   File "/var/lib/mailman/Mailman/Archiver/HyperDatabase.py", line 65, 
in __init__
     self.load()
   File "/var/lib/mailman/Mailman/Archiver/HyperDatabase.py", line 170, 
in load
     self.dict = marshal.load(fp)
ValueError: bad marshal data
dpkg: error processing mailman (--configure):
  subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
  mailman