Create a new unprivileged “kiosk” user that can login without a password
Install openbox (sudo apt-get install openbox) if it is not already installed. Note that Lubuntu should be packaged with openbox.
Create a ~/.xsession file (~/.xinitrc seemed to be ignored) with the following lines under the kiosk user’s home directory:
xset s off
chromium-browser %u http://www.abcmouse.com –start-maximized
Login with the new kiosk account using the “User Defined Session” session option (important). The “User Defined Session” option calls the code in .xsession when setting up the X environment.