Getting below error when I am trying to install Oracle 12c Release 2 on RHEL 7.
[oracle@oracledb database]$ ./runInstaller
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 500 MB. Actual 10828 MB Passed
Checking swap space: must be greater than 150 MB. Actual 2559 MB Passed
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 <<<<
Some requirement checks failed. You must fulfill these requirements before
continuing with the installation,
Continue? (y/n) [n] y
Best Answer
From the error message it seems you need to set the DISPLAY variable
Source: https://docs.oracle.com/cd/E57185_01/EPMIS/ch05s03s02s03.html