今天在安装Oracle配置监听的时候执行netca报错：Error: null Check the trace file for details: /u01/app/oracle/cfgtoollogs/netca/trace_OraDB12Home1-2303119PM5318.log Oracle Net Services configuration failed. The exit code is 1
问题已解决，解决步骤：
在root用户下执行xhost +
若执行xhost +时报错：xhost: unable to open display ""
配置export DISPLAY=本虚拟机链接Ip:0.0
再次执行xhost +
切换用户执行netca
报错：****DISPLAY environment variable not set!
Oracle Net Configuration Assistant is a GUI tool
which requires that DISPLAY specify a location
where GUI tools can display.
Set and export DISPLAY, then re-run.
在此用户下配置export DISPLAY=本虚拟机链接Ip:0.0
执行netca
可成功图形化安装