Upgrade to 3.6.6 fails - Couldn't migrate printers tdb file

[Chris Smith]

Upgrading from 3.5.15 to 3.6.6 failed.
Looks a bit like Bug 8235:
========================================================
[2012/07/04 09:02:38.341747,  0, effective(0, 0), real(0, 0)]
lib/charcnv.c:543(convert_string_talloc)
  Conversion error: Illegal multibyte sequence()
[2012/07/04 09:02:38.349010,  0, effective(0, 0), real(0, 0)]
printing/nt_printing_migrate_internal.c:237(nt_printing_tdb_migrate)
  Couldn't migrate printers tdb file: NT_STATUS_NO_MEMORY
[2012/07/04 09:02:38.349108,  0, effective(0, 0), real(0, 0)]
rpc_server/srv_pipe_register.c:222(rpc_srv_register)
  rpc_srv_register: Failed to call the spoolss init function!
========================================================

-- 
Chris