OK, I finally found out how to disable this key: in gconf-editor /apps/gnome-power-manager/action_button_suspend -> set value to "nothing"
/apps/gnome-power-manager/action_button_hibernate -> set value to "nothing" -- Pressing the 'user' key causes the system to reboot https://launchpad.net/bugs/68946 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
