An open source application that can freeze your Linux, it is like Deep Freeze in Microsoft Windows operating system. So, you can lock your system by using this application. Feel free and open with this application. (By: Muhammad Faruq Nuruddinsyah, 2008)
Worked fine for preliminary reboot. After the second reboot, I could not enter text under the "frozen" user. This is on Ubuntu 13.10--the directions are poor at best, and I'm not sure if what I want is what your designed for. However, I encountered the same problem when I was trying on my own to automate a Deep Freeze with crontab @reboot script, so problem may be something in latest Ubuntu. It is almost as if there are other files besides in home/username that control terminal input. I also wondered if there was something in gconf that messed up?