Unable to set user password

[tar-xzvff]

Bug description

I read this document and added a user.
https://tljh.jupyter.org/en/latest/install/custom-server.html#step-2-adding-more-users

But, the screen for setting a password is not displayed when the added user logs in for the first time.
How can I set a password?

Expected behaviour

can set a password when you log in for the first time

Actual behaviour

can't set a password

How to reproduce

Follow the "Installing on your own server" instructions to set up.
https://tljh.jupyter.org/en/latest/install/custom-server.html

Your personal set up

• OS:　Ubuntu18.04

• Version(s):

# /opt/tljh/hub/bin/jupyterhub --version
1.2.2

• Configuration

# jupyterhub_config.py
"""
JupyterHub config for the littlest jupyterhub.
"""

from glob import glob
import os

from systemdspawner import SystemdSpawner
from tljh import configurer
from tljh.config import INSTALL_PREFIX, USER_ENV_PREFIX, CONFIG_DIR
from tljh.utils import get_plugin_manager
from tljh.user_creating_spawner import UserCreatingSpawner
from jupyterhub_traefik_proxy import TraefikTomlProxy

c.JupyterHub.spawner_class = UserCreatingSpawner

# leave users running when the Hub restarts
c.JupyterHub.cleanup_servers = False

# Use a high port so users can try this on machines with a JupyterHub already present
c.JupyterHub.hub_port = 15001

c.TraefikTomlProxy.should_start = False

dynamic_conf_file_path = os.path.join(INSTALL_PREFIX, 'state', 'rules', 'rules.toml')
c.TraefikTomlProxy.toml_dynamic_config_file = dynamic_conf_file_path
c.JupyterHub.proxy_class = TraefikTomlProxy

c.SystemdSpawner.extra_paths = [os.path.join(USER_ENV_PREFIX, 'bin')]
c.SystemdSpawner.default_shell = '/bin/bash'
# Drop the '-singleuser' suffix present in the default template
c.SystemdSpawner.unit_name_template = 'jupyter-{USERNAME}'

tljh_config = configurer.load_config()
configurer.apply_config(tljh_config, c)

# Let TLJH hooks modify `c` if they want

# Call our custom configuration plugin
pm = get_plugin_manager()
pm.hook.tljh_custom_jupyterhub_config(c=c)

# Load arbitrary .py config files if they exist.
# This is our escape hatch
extra_configs = sorted(glob(os.path.join(CONFIG_DIR, 'jupyterhub_config.d', '*.py')))
for ec in extra_configs:
    load_subconfig(ec)

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[consideRatio]

I've created an issue about this in FirstUseAuthenticator where the fix for this needs to be made: jupyterhub/firstuseauthenticator#42

Also for reference, see #264 regarding work towards switching to another authenticator that can offer a better user experience with this regard, as well as #571 that is related.