Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 80 MB. Actual 10115 MB Passed
Checking swap space: must be greater than 150 MB. Actual 2047 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,at which time they will be rechecked.
Continue? (y/n) [n]
解决办法：
把系统注销，然后使用Oracle用户直接登录系统进入即可！
另外注意：环境变量配置文件中，如果加上官方文档中的一个参数
export DISPLAY=local_host:0.0
会导致不能以Oracle用户的身份登录到图形界面，提示什么10s什么的
