Hi folks. Another issue going on in the recent release of Ubuntu Oneiric is the gresistor error, showing Gtk-Warning in the middle of the process. Do not panic about the issue. Its just a package install.
If you get some errors like
(gresistor:2547): Gtk-WARNING **: Unable to locate theme engine in module_path: “pixmap”,
(gresistor:2547): Gtk-WARNING **: Unable to locate theme engine in module_path: “pixmap”,
(gresistor:2547): Gtk-WARNING **: Unable to locate theme engine in module_path: “pixmap”,
(gresistor:2547): Gtk-WARNING **: Unable to locate theme engine in module_path: “pixmap”,
Traceback (most recent call last):
File “/usr/bin/gresistor”, line 20, in <module>
from SimpleGladeApp import SimpleGladeApp
File “/usr/share/gresistor/SimpleGladeApp.py”, line 28, in <module>
import gtk.glade
ImportError: No module named glade
Then you have to install the pixbuffer gtk engines package.
Just run the following command in the terminal
sudo apt-get install gtk2-engines-pixbuf
Thats it 
Enjoy the shift of Ubuntu to the new dimension 