>>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed <<<< [SOLVED]

do you have problem with DISPLAY variable is set like on below.

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 <<<<

>>> Ignoring required pre-requisite failures. Continuing...

Preparing to launch Oracle Universal Installer from /tmp/OraInstall2014-10-18_02-24-58PM. Please wait ...oracle@yanipra-K43TA:~/database$ No protocol specified
Exception in thread "main" java.lang.NoClassDefFoundError
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:164)

to solve the problem, follow me.

1.login on root
2.root@yanipra-K43TA:/home/oracle# xhost +SI:localuser:oracle
3.and back to ./runInstaller again..

work fine🙂

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