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So I work at a university using active directory, and in my office there are a few computers that I've set up, in Ubuntu 11.10, to log as an AD user.

In order to log in a person just needs to use the "other" user at login and use their university ID and Password. I've installed 12.04LTS on my personal computer, and I see that the "other" option no longer exists.

If I upgrade those computers who need AD login capabilities, will they have them?

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I also join my test machine to the domain with likewise, and in terminal doing "su - <user>" it works fine, but still don't have the "other" in X login. – Pipe Apr 12 '12 at 13:08
up vote 18 down vote accepted

Edit /etc/lightdm/lightdm.conf and add the following line :

greeter-show-manual-login=true

Then restart lightdm :

sudo service lightdm restart
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1  
Works perfectly for me. – Gerald Schneider Sep 17 '12 at 13:04
2  
For later versions of Ubuntu (14.04) add this line to: /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf – L. D. James Jul 2 '15 at 15:40

You can also hide all users so that you enter whatever name you want by editing /etc/lightdm/lightdm.conf adding :

greeter-hide-users=true

This is particularly useful if you use NIS or LDAP services.

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From the Ubuntu wiki: https://wiki.ubuntu.com/LightDM

LightDM configuration is governed by the lightdm.conf file, however it's not suppose to be directly edited, instead use:

lightdm-set-defaults

I found the file at /usr/lib/lightdm/lightdm-set-defaults

At the terminal you would enter:

sudo /usr/lib/lightdm/lightdm-set-defaults -m true

Edit: While this was true temporarily for 12.04, it seems to not be true for any newer release, and editing conf files as otherwise suggested is the correct solution.

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1  
This utility (lightdm-set-defaults) does not exist on my system, and I can't figure out how to install it. askubuntu.com/questions/251041/… did not help, either. – foobarbecue Apr 14 '14 at 16:10
    
@foobarbecue, check that topic again. It appears things have changed with v14.04, and lightdm-set-defaults has been deprecated. – matt wilkie Jun 13 '14 at 20:20
    
Not just deprecated, removed, according to askubuntu.com/questions/251041/… – armb Jan 23 '15 at 10:17

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