安装SSH服务

1.  sudo apt install openssh-server
2.  sudo service ssh start
3.  ps -aux | grep ssh  判断是否开启成功

ubuntu18.04 install jdk

1. sudo apt install default-jdk 
2. java -version      

Installing OpenJDK 8

1. sudo apt update
2. sudo apt install openjdk-8-jdk
3. 设置JAVA_HOME环境变量  sudo update-alternatives --config java  查看java默认安装路径
4. 如为： /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
5. sudo nano /etc/environment
6. JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"
7. source /etc/environment
8. echo $JAVA_HOME

ubuntu18.04安装ssh服务和jdk

原文：https://www.cnblogs.com/semie/p/12635133.html