Ubuntu Tweak error in kubuntu

Traceback (most recent call last):
  File "/usr/bin/ubuntu-tweak", line 109, in <module>
    from ubuntutweak.mainwindow import MainWindow
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 148, in <module>
    MLOADER = ModuleLoader(modules.__path__[0])
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/__init__.py", line 27, in __init__
    package = __import__('.'.join([__name__, module]), fromlist=['modules'])
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/cleaner.py", line 39, in <module>
    from ubuntutweak.widgets.utils import ProcessDialog, SmartTerminal, TerminalDialog
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/widgets/utils.py", line 20, in <module>
    import vte
ImportError: No module named vte