deja-dup should depend on ubuntuone-couch

I don't know if this is really deja-dup related but everytime i try to mount an external drive like an usb-dongle, flash card or ipod touch it starts prompting this error message:

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1359, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1342, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1202, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 942, in ProcessCommandLine
    globals.backend = backend.get_backend(args[0])
  File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 156, in get_backend
    return _backends[pu.scheme](pu)
  File "/usr/lib/python2.7/dist-packages/duplicity/backends/u1backend.py", line 74, in __init__
    self.create_volume()
  File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 319, in iterate
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/duplicity/backends/u1backend.py", line 160, in create_volume
    import ubuntuone.couch.auth as auth
ImportError: No module named couch.auth

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: deja-dup 19.92-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
Date: Mon Sep 19 16:14:27 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/deja-dup
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
ProcEnviron:
 LANGUAGE=de:en
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 LC_MESSAGES=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: deja-dup
UpgradeStatus: Upgraded to oneiric on 2011-09-19 (0 days ago)