My home network is used only by my parents except me. So it’s not necessary but I wanted to do that.
This server’s OS is Debian 6.0 squeeze, upgraded from Debian 5.0 lenny, as I posted the entry about. On the update, the aptitude deleted my Gnome desktop. So I reinstalled Gnome on this server. And the Shutdown button appears again and I could shutdown by cliking it without root password.
I write the quote below on newly made /etc/polkit-1/localauthority/50-local.d/consolekit.pkla . (The quoted is made by him.) The last .pkla on the filename is important. It’s the extension for the configuration. You can fill anything not blank between [ and ].
But I could still shutdown this server from my Gnome desktop. I took the configuration for not working. It works actually. But the trial on another account, the desktop asks me the root password. My non-root account belonged to “powerdev” account group. And it let me shutdown without root password. So I deleted myself from “powerdev” group by vigr. And I could disabled.