That's a known ubuntu bug, unrelated to gnome-keyring and xfce4-power-manager, see <http://askubuntu.com/questions/1190/how-can-i-make-shutdown-not-require-admin-password> for instance.
That's a known ubuntu bug, unrelated to gnome-keyring and xfce4-power- manager, see <http:// askubuntu. com/questions/ 1190/how- can-i-make- shutdown- not-require- admin-password> for instance.