There is no /usr/local/lib/python3.10/dist-packages/duplicity/ directory on our MiaB instance. Currently, running “duplicity --version” returns “duplicity 2.1.3” and running “python3 --version” returns “Python 3.10.12” on our instance. Compare what you see from your MiaB instance to these versions. If you see different versions then review what was reported when you ran “apt purge python3-future” and compare that to what I quoted yesterday appearing above, adjusting for the now newer version of duplicity.
If something appears wrong, or if you continue the see the error message that you quoted, then I recommend reinstalling python and duplicity by running “apt-get reinstall python3” and “apt-get reinstall duplicity” which should correct any installation or update errors related to those packages. I hope that this helps.