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So you don't want to use the RADIUS feature of your MS Windows server, do you? Here you go, FreeRADIUS , an open-sourced project that will please you. Assuming: 172.100.99.100: FreeRADIUS IP address mydomain.com : domain name mydc.mydomain.com : domain controller MYNTDOMAIN : nt domain name 1. Install samba, winbind, krb5-user: sudo apt install samba winbind  krb5-user 2. Config samba by editing: a. /etc/samba/smb.conf: ... [global] ## Browsing/Identification ### # Change this to the workgroup/NT-domain name your Samba server will part of    workgroup = MYNTDOMAIN # need to add these     security = ads     password server = mydc.mydomain.com     realm = MYDOMAIN.COM     winbind use default domain = true ... b. /etc/krb5.conf: [libdefaults]         default_realm = MYDOMAIN.COM ... [realms]         MYDOMAIN.COM = {       ...

This morning, I just tried to install FreeRadius 3.0.X on my Ubuntu 16.04 server. And it said that I have to install freeradius-config in order to finish the installation. But, I got these error messages: ... dpkg: error processing archive /var/cache/apt/archives/freeradius-config_3.0.12-ppa1~xenial_amd64.deb (--unpack):  trying to overwrite '/etc/freeradius/hints', which is also in package freeradius 3.0.12-ppa1~xenial Errors were encountered while processing:  /var/cache/apt/archives/freeradius-config_3.0.12-ppa1~xenial_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) ... So what I did to fix that is to run the following command to force orverwrite the freeradius-config page: sudo dpkg -i --force-overwrite /var/cache/apt/archives/freeradius-config_3.0.12-ppa1~xenial_amd64.deb Then the rest was fine.