注意软件版本是Oracle Enterprise Linux 6.2，不是Red Hat 。

 
1、异常现象
 
1.1 startx命令不可用
[root@ebs122 cdrom]# startx
-bash: startx: command not found

2、问题分析
Linux的图形用户界面（X windows）主要有gnome和KDE两种桌面环境，ORACLE Linux也一样，两种
桌面可以并存，可以切换，上述问题情况属于没有安装gnome和KDE的问题。

2.1 查看gnome和KDE包是否安装
[root@ebs122 /]# rpm -qa |grep gnome
[root@ebs122 /]# rpm -qa |grep kde
发现没有安装。

3、安装linux图形界面软件
 
3.1 配置yum
具体参考：http://blog.itpub.net/35489/viewspace-1263896/

3.2 安装X Windows System
 
3.2.1验证可以安装的组件
#yum grouplist

Loaded plugins: refresh-packagekit, security
Setting up Group Process
HighAvailability | 3.7 kB 00:00 ...
LoadBalancer | 3.7 kB 00:00 ...
Server | 3.7 kB 00:00 ...
oel6_local | 3.7 kB 00:00 ...
Installed Groups:
Additional Development
Base
Console internet tools
Debugging Tools

        Desktop
Desktop Platform
Dial-up Networking Support
Directory Client
E-mail server
Fonts
General Purpose Desktop
Graphical Administration Tools
Hardware monitoring utilities
Java Platform

       KDE Desktop
Large Systems Performance
Legacy UNIX compatibility
Legacy X Window System compatibility
MySQL Database client
MySQL Database server
....
Scientific support
Server Platform

        X Window System
Installed Language Groups:
Arabic Support [ar]
Armenian Support [hy]
Inuktitut Support [iu]
....
Xhosa Support [xh]
Zulu Support [zu]
Done

其中“Desktop”安装组安装的就是GNOME组件,“KDE Desktop”安装组安装的就是KDE组件