ubuntu 7.10 不能关机

[zhangsonglin_cjr]

我的ubuntu 7.10不能关机。
关机前显示：
nm_hal_deinit():libhal shutdown failed - Connection is closed.
nm_dbus_init(): nm_dbus_init() could not get the system bus. Make sure the message bus daemon is running!
然后就死机了。
但是，重新启动是正常的。