How to solve xdpyinfo Errors

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 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


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

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