It also needs python3-six:
richard@sfere:~$ /usr/sbin/update-apt-xapian-index
Traceback (most recent call last):
File "/usr/sbin/update-apt-xapian-index", line 61, in <module>
import axi.indexer
File "/usr/lib/python3/dist-packages/axi/indexer.py", line 39, in
<module>
from six.moves.urllib_parse import unquote
ModuleNotFoundError: No module named 'six'ttfn/rjk
