[grid@db1 ~]$ /dbi/oracle/V19Grid/gridSetup.sh
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.
[grid@db1 ~]$ su - root
Password: 
Last login: Thu Oct 12 04:08:04 EDT 2023 on pts/0
[root@db1 ~]# sudo yum install xorg-x11-xauth
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-
              : manager

This system is registered with an entitlement server, but is not receiving updates. You can use subscription-manager to assign subscriptions.

Package 1:xorg-x11-xauth-1.0.9-1.el7.x86_64 already installed and latest version
Nothing to do
[root@db1 ~]# 

[root@db1 ~]# su - grid
Last login: Thu Oct 12 10:17:43 EDT 2023 on pts/0
[grid@db1 ~]$ export DISPLAY=10.0.5.15:0.0
[grid@db1 ~]$ /dbi/oracle/V19Grid/gridSetup.sh
ERROR: Unable to verify the graphical display setup. This application requires X display. Make sure that xdpyinfo exist under PATH variable.

Can't connect to X11 window server using '10.0.5.15:0.0' as the value of the DISPLAY variable.
[grid@db1 ~]$ hostname -I | awk '{print $1}'
10.0.5.15
[grid@db1 ~]$ 

yum install tigervnc-server