VNC环境下Oracle安装图形界面安装：
[oracle@chengyu ~]$ cd /home/softwares/oracle/19c/
[oracle@chengyu 19c]$ ./runInstaller
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.
确定连接的vnc是几号号桌面，这里是3号桌面：
[root@chengyu ~]# vncserverWarning: chengyu:1 is taken because of /tmp/.X11-unix/X1Remove this file if there is no X server chengyu:1New 'chengyu:3 (root)' desktop is chengyu:3Starting applications specified in /root/.vnc/xstartupLog file is /root/.vnc/chengyu:3.log
解决：
[oracle@chengyu ~]$ export DISPLAY=":3.0"[oracle@chengyu ~]$ echo $DISPLAY:3.0[oracle@chengyu ~]$ xhost +access control disabled, clients can connect from any host[oracle@chengyu 19c]$ xdpyinfo | headname of display: :3.0version number: 11.0vendor string: The Foundationvendor release number:version: 1.20.1maximum request size: 16777212 bytesmotion buffer size: 256bitmap unit, bit order, padding: 32, LSBFirst, 32image byte order: LSBFirstnumber of supported pixmap formats: 6[oracle@chengyu ~]$ cd /home/softwares/oracle/19c/[oracle@chengyu 19c]$ ./runInstaller Launching Oracle Database Setup Wizard...
OK：
其实，可以在安装Oracle之前通过xclock来验证是否能够正常弹出安装界面：
[root@chengyu ~]# yum -y install xorg-x11-apps
[root@slave oracle]# xclock
