Traceback (most recent call last):
  File "/usr/bin/hp-toolbox", line 246, in <module>
    from ui4.devmgr5 import DevMgr5
  File "/usr/share/hplip/ui4/devmgr5.py", line 45, in <module>
    from dbus.mainloop.qt import DBusQtMainLoop
ImportError: No module named qt