apt-key del 5072E1F5 apt-get update apt-key adv --keyserver keyserver.ubuntu.com --recv 8C718D3B5072E1F5 apt-get update ls cd /root ls cd jdk1.8.0_251/ ls cd .. vim /etc/profile apt-get install vim vim /etc/profile source /etc/profile java -v java -version apt-get install redis-server ls