今天因工作需要开启linux系统的桌面环境，使用startx未成功，报如下错误：
[root@5201351 /]# startx
xauth: creating new authority file /root/.serverauth.2002
xinit: No such file or directory (errno 2): no server "/usr/bin/X" in PATH
Use the -- option, or make sure that /usr/bin is in your path and
that "/usr/bin/X" is a program or a link to the right type of server
for 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 server
giving up.
xinit: No such file or directory (errno 2): unable to connect to X server
xinit: 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：
静下心来仔细一想、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