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You really ought to use SSH instead of telnet as it is encrypted, unlike telnet, which is clear text. Make sure sshd is running on your system, and you just need a SSH client and you're set.
If you really need telnet (and there's no good reason for it except some highly specific conditions) then just "apt-get install telnetd", make sure it's set to run in your inetd or xinetd configuration (my Debian uses inetd so the config is /etc/inetd.conf -- just uncomment the telnet line), and restart inetd or xinetd.
Hmmm do you have a telnet server listening on these boxes? Don't expect Debian to install anything as crappy as Telnet by default. If you want to use it, you will need to install it.
btw... Telnet is old, broken and evil. Use SSH instead.
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