问题描述：
在Linux + oracle 安装时，采有root 帐号登录x-windows 界面，然后
$su oracle 登录录安装Oracle 报以下错误：
>>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.
Some requirement checks failed. You must fulfill these requirements before
continuing with the installation,Continue? (y/n) [n]
>>> Ignoring required pre-requisite failures. Continuing...The commandline for unzip:/tmp/orcl/linuxamd64_12102_database/database/install/unzip -qqqo
解决办法：
1、直接用oracle用户登录 x-window ，进行安装；
2、用root用户运行
# xhost + 本机IP
然后
$su oracle 安装oracle 数据库
原文地址：http://blog.csdn.net/snowfoxmonitor/article/details/52346512