What a pain. Imagine you are in Windows network environment and have a small amount of Ubuntu desktops. You task is to let them join the Active Directory so users can login with their known credentials. There is a package in universe called “authtool” even providing and promising to do what you need.
Sadfully it is quite broken in it’s current status and if you ask me one should even consider removing it until it does at least not break you boot (don’t ask for details) and has a good set of working dependencies. There are other methods as ldap-binding but in my eyes there are either not stable or just too complicated to configure (and therefore hardly qualified for convincing people).
But a solution approaches if you read the following Ubuntu blueprint “Single User Interface to Join and Participate in Microsoft Active Directory Domains“. Currently you might not find much more information about it. So I dropped a line to the blueprint creator Gerald ‘Jerry’ Carter who was so kind of updating me with the current status of the project (and happens to be directly involved in Likewise):