I created the superuser (used default, mailman).
<venv> $ mailman-web createsuperuser Username (leave blank to use 'mailman'): Email address: Password: Password (again): Superuser created successfully.
When I try to login I get a 403 error. No errors are in the apache2 log.
As for archives, I'm going to https://localhost/archives/list/llllllllll@dddddd.net/
No, I am not logged in. I am an admin on mailman2 so I thought it would import credentials. But I am unable to log in as anyone (password problem). I see 3 options on the archive page, recent, active and popular. None of which show any threads. Since the list has been dormant for quite a while there are no 'recent' posts nor 'active' posts. I don't know what makes a thread 'popular'. I guess the only way to know what is going on at this point is to be able to login as superuser.