Comment 7 for bug 657850

I have the same problem. But I also tried this quick fix and it does not work for me either.

When I try this command in a terminal :
kedoc@compaq-laptop:~$ dbus-send --print-reply --dest=com.ubuntu.sso /credentials com.ubuntu.sso.ApplicationCredentials.login_to_get_credentials "string:Ubuntu One" "string:Workaround for LP:657850" int64:0
method return sender=:1.123 -> dest=:1.188 reply_serial=2

The terminal where ubuntuone-preferences was launched printed :
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/bin/ubuntuone-preferences", line 1051, in got_newcredentials
    self.present()
  File "/usr/bin/ubuntuone-preferences", line 1031, in present
    self.dialog.connect_desktopcouch_exclusion()
  File "/usr/bin/ubuntuone-preferences", line 708, in connect_desktopcouch_exclusion
    self.dcouch = dcouch.ReplicationExclusion()
  File "/usr/lib/python2.6/dist-packages/desktopcouch/replication_services/ubuntuone.py", line 124, in __init__
    ctx=ctx)
  File "/usr/lib/python2.6/dist-packages/desktopcouch/records/server.py", line 56, in __init__
    server_class=server_class, oauth_tokens=oauth_tokens, ctx=ctx)
  File "/usr/lib/python2.6/dist-packages/desktopcouch/records/server_base.py", line 155, in __init__
    self._reconnect()
  File "/usr/lib/python2.6/dist-packages/desktopcouch/records/server.py", line 64, in _reconnect
    super(CouchDatabase, self)._reconnect(uri=uri)
  File "/usr/lib/python2.6/dist-packages/desktopcouch/records/server_base.py", line 187, in _reconnect
    if self._database_name not in self._server:
  File "/usr/lib/pymodules/python2.6/couchdb/client.py", line 124, in __contains__
    self.resource.head(validate_dbname(name))
  File "/usr/lib/pymodules/python2.6/couchdb/client.py", line 981, in head
    return self._request('HEAD', path, headers=headers, **params)
  File "/usr/lib/pymodules/python2.6/couchdb/client.py", line 1035, in _request
    raise ServerError((status_code, error))
ServerError: (500, '')