Package: ftp.debian.org Severity: normal kabikaboo cannot be installed in unstable since the removal of python-gtkspell, and was not released in stretch. It is also one of the packages keeping the deprecated python-gnome2 in the archive. There has been no upstream release since 2009 (or 2010 if you count Windows) so it seems unlikely to be ported to GObject-Introspection. I think it's time to let it go.
Thanks, smcv