1.开启linux系统的桌面环境，使用startx未成功，报如下错误：

提示：

[root@5201351 /]# startxxauth:  creating new authority file /root/.serverauth.2002xinit:  No such file or directory (errno 2):  no server "/usr/bin/X" in PATHUse the -- option, or make sure that /usr/bin is in your path andthat "/usr/bin/X" is a program or a link to the right type of serverfor your display.  Possible server names include:    Xorg        Common X server for most displays    Xvfb        Virtual frame buffer    Xfake       kdrive-based virtual frame buffer    Xnest       X server nested in a window on another X server    Xephyr      kdrive-based nested X servergiving up.xinit:  No such file or directory (errno 2):  unable to connect to X serverxinit:  No such process (errno 3):  Server error.

再继续使用init 5命令进行切换时，同样报错Retrigger failed udev events，如下图所示：

这是因为init 5执行的条件是得linux操作系统得有图形环境，因此很可能是未安装桌面环境

解决方法，安装Gnome桌面环境即可：

 

[root@5201351 ~]yum groupinstall "Desktop"  -y [root@5201351 ~]yum groupinstall "X Window System" -y 安装时间比较长.