ssh

1. apt-get install ssh
   
2. login : ssh user1@remote_server
   
3. copy :scp user1@remote_server:~/file.txt .
   (copy home directory file.txt from remote_server , use user name = user1 to local current folder
   
4. copy folder add -r. example
   copy :scp -r user1@remote_server:~/ .
   
5. If you want use XManager to connect the Ubuntu, select xterm(Linux).
   
6. If you want to allow root to login, set "PermitRootLogin Yes"
7. Remember to restart service(/etc/init.d/ssh restart)
   if you change the /etc/ssh/sshd_config.
   
8. Reference
   
   1. ubuntu SSH遠端安全連線安裝及設定