I installed Ubuntu 12.04 in the computer lab.
Accounts: tech (admin) and student (desktop user, auto login)

I would like to create a startup script that sets the student background to an image of my choosing.
I though I found the settings file at /var/lib/AccountServices/users/student, but locking it or changing it has no effect.
The last background the studemt picks still pops up on reboot.

Any ideas on how to set the student background on startup and/or lock the setting.

Thanks,

Greg Styles
Twin Valley Middle School
http://gsedtech.blogspot.com/