Can't run 0publish-gui on Ubuntu

Hello,

I have Python and GTK libraries installed via APT, and I installed
0publish-gui using the following command:
    0install add 0publish-gui
http://0install.net/2007/interfaces/0publish-gui.xml

But when I try to run 0publish-gui, I get the following error:
============
$ 0launch http://0install.net/2007/interfaces/0publish-gui.xml
Traceback (most recent call last):
  File "/home/gustavo/.cache/
0install.net/implementations/sha256new_DAN5QUVXBAISQGMY7SLLXSB65Y3IN2POYIKNBUU4YNQVOMSVLPWA/0publish-gui",
line 10, in <module>
    from main import FeedEditor, choose_feed
  File "/home/gustavo/.cache/
0install.net/implementations/sha256new_DAN5QUVXBAISQGMY7SLLXSB65Y3IN2POYIKNBUU4YNQVOMSVLPWA/main.py",
line 7, in <module>
    import gtk.glade
ImportError: No module named glade
/home/gustavo/.cache/
0install.net/implementations/sha256=ccefa7b1873926de15430341b912466929fbff8116b6d0ad67c4df6d0c06243e/ROX-Lib2/python/rox/debug.py:45:
GtkWarning: Theme file for default has no directories

  box.show()
================

Thoughts?

Thanks in advance!

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