Validating sudospawner configured correctly

https://jupyterhub.readthedocs.io/en/stable/howto/configuration/config-sudo.html

test sudo setup

Passes

sudo -u ubuntu sudo -n -u $USER /opt/jupyterhub/bin/sudospawner --help

sudo -u ubuntu sudo -n -u $USER echo 'fail'
sudo: a password is required

Test that PAM works

 sudo -u ubuntu /opt/jupyterhub/bin/python3 -c "import pamela, getpass; print(pamela.authenticate('$USER', getpass.getpass()))"
Password:
None

wrong password leads to

pamela.PAMError: [PAM Error 7] Authentication failure