# vi /etc/dconf/db/gdm.d/00-login-screen [org/gnome/login-screen] disable-user-list=true # dconf update
# vi /etc/dconf/db/gdm.d/01-no-shield [org/gnome/desktop/session] idle-delay=uint32 0 # dconf update
#vi /etc/xdg/autostart/gnome-initial-setup-first-login.desktop (..snip..) X-GNOME-Autostart-enabled=false <-- 追加