Fedora 14 中使用su后出现错误：GLib-GIO:ERROR:gdbusconnection.c:2270:initable_init: assertion failed: (connection->initialization_error ==

在 GNOME 桌面的终端，直接 su 切换到 root 后，在终端运行一些图形界面的程序，有些能运行但报错，有些根本运行不起来。可能是因为直接用 su 切换到 root 后，root 还是使用普通用户的环境变量。

在 Fedora 14 运行出错的软件有： gedit 、emacs 、unetbootin-linux

gedit
出现信息如下：
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(process:15979): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
(gedit:15979): EggSMClient-WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported
**
GLib-GIO:ERROR:gdbusconnection.c:2270:initable_init: assertion failed: (connection->initialization_error == NULL)
已放弃 (core dumped)
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emacs
出现信息如下：
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(process:15988): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
**
GLib-GIO:ERROR:gdbusconnection.c:2270:initable_init: assertion failed: (connection->initialization_error == NULL)
Fatal error (6)已放弃 (core dumped)
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unetbootin-linux
出现信息如下：
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Qt: Session management error: None of the authentication protocols specified are supported
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解决方法：
用 su - 命令切换到 root
"-”参数指示 su 开启一个登陆Shell(login shell)而不是非登陆Shell(non-login shell)
这样 root 读取的是 root 本身的环境变量，而不是继承那个输入 su 命令用户的环境变量