ERROR: Unable to verify the graphical display setup.

在Linux下安装Oracle时

运行

./runInstaller

报错

ERROR: Unable to verify the graphical display setup. This application requires X display. Make sure that xdpyinfo exist under PATH variable.
No X11 DISPLAY variable was set, but this program performed an operation which requires it.

 解决方法：

vncserver

root@localhost ~]# vncserver

        New 'localhost:1 (root)' desktop is localhost:1

        Starting applications specified in /root/.vnc/xstartupLog file is /root/.vnc/localhost:1.log

export DISPLAY=localhost:1

xhost +

access control disabled, clients can connect from any host 

出现上面提示即可。再次运行

./runInstaller

若是运行上述命令的时候，提示没有vncserver这个命令，则执行：

yum install tigervnc-server 

若是提示没有xhost,则执行：

yum whatprovides "*/xhost"     ----------------------查看是哪些提供了 */xhost

Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
base/filelists_db                                                               | 3.4 MB     00:00 ... 
xorg-x11-server-utils-7.7-2.el6.x86_64 : X.Org X11 X server utilities    ---------------------就是缺少这个包xorg-x11-server-utils-7.7-2.el6.x86_64
Repo        : base
Matched from:
Filename    : /usr/bin/xhost

安装xorg-x11-server-utils-7.7-2.el6.x86_64

yum -y install xorg-x11-server-utils-7.7-2.el6.x86_64

这样这两个命令就都可以用啦。