Ubuntu AD authentication nightmare

in Off-Topic
Disclaimer: my Linux sucks!
Scenario: Trying to authenticate a test Ubuntu 12.04 box with AD. All I want is to be able to log in as an AD user. I do not want to join the machine to the domain. Have been trying this and this but something is not working and I have no idea what it is. Any pointers are appreciated.
Scenario: Trying to authenticate a test Ubuntu 12.04 box with AD. All I want is to be able to log in as an AD user. I do not want to join the machine to the domain. Have been trying this and this but something is not working and I have no idea what it is. Any pointers are appreciated.