I) Install Telnet Server in Ubuntu
1) install the telnet package: sudo apt-get install telnetd
2) start the telnet service: sudo /etc/init.d/openbsd-inetd restart
II) Install SSH Server in Ubuntu
1) install the SSH package: sudo apt-get install ssh
2) start the telnet service: sudo /etc/init.d/ssh restart
III) Download the client software: http://iij.dl.sourceforge.jp/ttssh2/38350/teraterm-4.62.exe