excalibur initdb error on ubuntu

hi, I'm trying to get excalbur to work in ubuntu but get below error. Gemini AI suggests: "The error message you're encountering with excalibur initdb suggests there's a compatibility issue within the excalibur package. It seems the package relies on the MutableMapping class from collections, which has been removed in Python 3.10 and above."

(excalibur) xxx:~$ excalibur initdb
Traceback (most recent call last):
File "/home/rupert/anaconda3/envs/excalibur/bin/excalibur", line 5, in
from excalibur.cli import cli
File "/home/rupert/anaconda3/envs/excalibur/lib/python3.12/site-packages/excalibur/cli.py", line 7, in
from . import __version__, settings
File "/home/rupert/anaconda3/envs/excalibur/lib/python3.12/site-packages/excalibur/settings.py", line 10, in
from . import configuration as conf
File "/home/rupert/anaconda3/envs/excalibur/lib/python3.12/site-packages/excalibur/configuration.py", line 7, in
from backports.configparser import ConfigParser
File "/home/rupert/anaconda3/envs/excalibur/lib/python3.12/site-packages/backports/configparser/__init__.py", line 130, in
from collections import MutableMapping
ImportError: cannot import name 'MutableMapping' from 'collections' (/home/rupert/anaconda3/envs/excalibur/lib/python3.12/collections/__init__.py)

Start with the excalibur initdb entry point and trace the imports through cli.py, settings.py, and configuration.py to the backports.configparser dependency shown in the traceback. Reproduce the failure under Python 3.12 on Ubuntu, then verify that excalibur initdb starts successfully without the MutableMapping import error.

Written by the indexing model from the issue text.