Have you been trying to get winbind working on Ubuntu, and not having any luck? After the usual:
sudo apt-get install winbind
You also need to install libnss-winbind as well:
sudo apt-get install libnss-winbind
That should get it working, when combined with the change of the hosts: line in /etc/nsswitch.conf from:
hosts: files dns
hosts: files dns wins
And presto, it should start working.