lemon ldap tutorial
apt install apt-transport-https
wget -O - https://lemonldap-ng.org/_media/rpm-gpg-key-ow2 | apt-key add -
echo "deb https://lemonldap-ng.org/deb stable main" > /etc/apt/sources.list.d/lemonldap-ng.list
apt update
apt install lemonldap-ng