Comment 7 for bug 71593

python-gtkglext1 has been added to Debian unstable in the last week:
http://packages.debian.org/unstable/python/python-gtkglext1

The glchess packaged version is slightly better as it builds the bindings for all the installed versions of Python (though I suspect this change will be added to the Deb Unstable version soon).

Hopefully it will be picked up for Feisty+1? Once Ubuntu has picked up the package I get to stop maintaining it :)