I've tried everything and it seems to install but doesn't work when I open the lens cover. I typed this "python /usr/lib/hildon-desktop/lfocuswi.py" in xterminal and I get:

Traceback (most recent call last):
File "/usr/lib/hildon-desktop/lfocuswi.py", line 1, in <module>
import gtk, pygtk, os,sys,time,math,hildon,hildondesktop.dbus,gobject
ImportError: No module named hildon