更改桌面效果时出错，现在进入X慢得像死机

prokey

我是新手，更改桌面效果时出了问题，进入安全模式出现这个提示，请问如何处理？
there was an error starting the GNOME Setting Daemon.
some things, such as themes, sounds, or background settings may not work correctly.
the last error message was:
failed to ececute dbus-launch to autolaunch D-Bus session GNOME will still try to restart the Settings Daemon next time you log in.