Traceback (most recent call last):
  File "/usr/share/kde4/apps/system-config-printer-kde/system-config-printer-kde.py", line 2387, in on_btnNPForward_clicked
    self.nextNPTab()
  File "/usr/share/kde4/apps/system-config-printer-kde/system-config-printer-kde.py", line 2580, in nextNPTab
    self.ppd = self.getNPPPD()
  File "/usr/share/kde4/apps/system-config-printer-kde/system-config-printer-kde.py", line 3531, in getNPPPD
    os.environ["PPD"] = filename
  File "/usr/lib/python2.7/os.py", line 471, in __setitem__
    putenv(key, item)
TypeError: must be string, not QString