xhost: unable to open display "" | Check if the DISPLAY variable is set | Oracle Linux

xhost:  unable to open display "" | Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set

Linux Unix OS Issues

Installation of Oracle Linux 7.5 on VirtualBox - Installation Guide

Installation of Oracle Linux 7.5 via Virtual Box on Windows 64-bit

Step by step instructions to install Oracle Linux 7.5 with the help of Virtual Box on Windows 64-bit machine.

Installation of Oracle Linux 7.5 on Virtual Box