To disable the powerbutton on my ubuntu-box, I tried this:
cd /etc/acpi
sudo mv powerbtn.sh powerbtn.sh.orig
ln -s /etc/false powerbtn.sh
But that’s defenitly not doing anything.
so, I had to run “gconf-editor” (Alt+F2): Browse to apps -> gnome-power-manager -> buttons and change the “power” value to “nothing”.