[MM3-users] Re: Problems after upgrading from bullseye to bookworm

I'm brand new to this, so take this with a grain of sale, but, I had a similar problem a few days ago, however, mine was "flufl.i18n>=3.2". Perhaps the same thing is happening with flufl.lock (but that didn't bite me).

I solved my problem by following this: <https://gitlab.com/mailman/mailman/-/issues/1085> and, ultimately modifying "$VENV_ROOT/lib/$PYVERSION/site-packages/mailman-3.3.8.egg-info/requires.txt" per that thread (see <https://gitlab.com/mailman/mailman/-/issues/1085#note_1442207929> by Thomas Ward section called "The WORKAROUND"). Maybe you need to do the same thing, but for flufl.lock.