On Oracle Linux 10, Oracle Database Client, Oracle Database Gateway, and GSM installations display one or more of the following errors about graphical display setup:

Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.

ERROR: Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed
Some requirement checks failed. You must fulfill these requirements before continuing with the installation,
Continue? (y/n) [n]

Workaround:

Enter y to continue with the installation.