我正在useRef之后在Ubuntu 18.04中安装Hadoop。我已经尝试解决它，阅读stackoverflow答案，但是仍然有问题。这是输出。我该怎么办？
hadoop@victor-GL552VW:~/hadoop/sbin$ ./start-yarn.sh
Starting resourcemanager
Starting nodemanagers
localhost: hadoop@localhost: Permission denied (publickey,password).