If you run your PC as Family PC for Kids or Public PC you have to make some changes:

Step:

1. Setup Ubuntu 10.04 with alternate Disk!
2. select XDM as Login Manager by default!!
3. go /etc/init folder as root
4. edit control-alt-delete.conf and disable reboot without login
5. go /etc/acpi make chmod 000 on powerbtn.sh hibernation.sh lidbtn.sh to prevent unwanted shutdown
6. make #sudo aptitude remove gnome-power-manager to prevent unwanted standby by all users
7. test forced shutdowns pressing all buttons at menu
8. optional add autologin at login manger for a user without “sudo” rights
9. optional add to startup the opera -kioskmode Browser Command (fullscreen Opera to hide Desktop to prevent users to reach files on the system)