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1. apt-get install xinetd
2. 安装: telnetd_0.17-29build1_i386.deb
3. 修改或创建以下两个文件
4. 重启

##------------------------------------------------------------##

# <</etc/xinetd.conf>>

# Simple configuration file for xinetd
#
# Some defaults, and include /etc/xinetd.d/

defaults
{
instances = 60
log_type = SYSLOG authpriv
log_on_success = HOST PID
log_on_failure = HOST
cps = 25 30
}

includedir /etc/xinetd.d

##------------------------------------------------------------##

# <</etc/xinetd.d/telnet>>

# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}

##------------------------------------------------------------##

telnetd下载地址：http://archive.ubuntu.com/ubuntu/pool/u ... it-telnet/

补充一点：
重启可以使用 sudo /etc/init.d/xinetd restart 来实现