sudo apt-get autoremove openjdk-9-jre openjdk-9-jdk
https://www.linuxidc.com/Linux/2017-11/148941.htmhttps://askubuntu.com/questions/335457/how-to-uninstall-openjdk
uninstall OpenJDK9
原文：https://www.cnblogs.com/pengmn/p/9161897.html
