Hi!

I am trying to install Mailman3 using this tutorial/documentation: https://wiki.list.org/DOC/Howto_Install_Mailman3_On_Debian10 So far, so good. But running

(venv) mailman@listserver: mailman info

throws an error:

sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgres

First, I thought SQLAlchemy is missing, but:

(venv) mailman@listserver: pip install sqlalchemy Requirement already satisfied: sqlalchemy in ./venv/lib/python3.9/site-packages (2.0.4) Requirement already satisfied: typing-extensions>=4.2.0 in ./venv/lib/python3.9/site-packages (from sqlalchemy) (4.5.0) Requirement already satisfied: greenlet!=0.4.17 in ./venv/lib/python3.9/site-packages (from sqlalchemy) (2.0.2)

How can I fix this? Thank you very much for your help.

Regards