[ubuntu] ssh error connect to host localhost port 22: Connection refused

ssh localhost 접속을 할 때 접속 거부를 당하는 경우가 있다.

$ ssh localhost 

$ sudo ufw enable    

$ sudo apt-get install openssh-server

출처

http://stackoverflow.com/questions/17335728/connect-to-host-localhost-port-22-connection-refused