$ deluge
Traceback (most recent call last):
  File "/usr/bin/deluge", line 31, in <module>
    import deluge, deluge.dcommon, deluge.delugegtk
  File "/usr/lib/python2.5/site-packages/deluge/dcommon.py", line 22, in <module>
    import xdg, xdg.BaseDirectory
ImportError: No module named xdg