[K12OSN] FL_teachertool & Edubuntu

Jim McQuillan jam at mcquil.com
Sat May 6 13:58:27 UTC 2006

On Sat, May 6, 2006 6:38 am, Luis Arauz wrote:
> Has anyone gotten Teachertool to work with edubuntu Dapper? If so how did
> you do it?

The biggest difference between the way Ubuntu has implented LTSP and how
we've been doing it, is they don't use Xdmcp.

They use a local display manager that they've named 'LDM' == Ltsp Display
Manager.  It's just a gui wrapper around ssh.  You enter your username and
password, and LDM passes them on to ssh, which then invokes the xsession
script on the server.  the Xsession script then launches gnome.  At this
point, the DISPLAY env variable is something like 'localhost:10.0'.  So,
Robert's technique of looking for 'ws001:0.0' breaks when using Ubuntu's

I'm sure there are other things in Ubuntu-ltsp that can cause problems for
Teachertool, but that's the big one.

Jim McQuillan
jam at Ltsp.org

> Ive been able to install the app and get it up and running but it doesnt
> recognize any of the users
> as being on. It keeps saying "No users logged in."  and then opens up the
> interface.
> I know that Robert Arkiletian has mentioned that he wants to port it over
> to
> EDubuntu but he doesnt know
> how different it is from LTSP.
> Is it possible to use Ubuntu and the LTSP packages to have teachertool
> working?
> Thanks for any help you can offer
> Luis
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