xdpyinfo Errors

The following error messages indicate that xdpyinfo is not installed:

Checking monitor: must be configured to display at least 256 colors
Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed.

The xdpyinfo program must be installed.

Type the following command.

yum install xorg-x11-utils-<version-number>

If the program is already installed, check whether the oracle user has execute privileges.
```
[oracle@ouzo ~]$ cd /usr/bin
[oracle@ouzo bin]$ ls -al | grep xdpyinfo
-rwxr-xr-x   1 root root      38112 Feb 23  2015 xdpyinfo
```
Note:
In this example, the oracle user has execute privileges.
If the oracle user does not have executable privileges, log in as root and execute this command:
```
xhost +SI:localuser:oracle
```
Log in as the oracle user and run the installer.
```
./runInstaller
```