Get the following after in Debian unstable "apt install cambalache".
$ cambalache
Traceback (most recent call last):
File "/usr/bin/cambalache", line 42, in <module>
from cambalache.app import CmbApplication
File "/usr/lib/python3/dist-packages/cambalache/__init__.py", line 90, in
<module>
from .cmb_view import CmbView
File "/usr/lib/python3/dist-packages/cambalache/cmb_view.py", line 35, in
<module>
gi.require_version('Casilda', '0.1')
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/gi/__init__.py", line 122, in
require_version
raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Casilda not available
