I installed Ubuntu server and I am learning to how secure it.

One of the article I saw, was about telnet and how to disable it on CentOS

Obviously, it does not work on Ubuntu, so How can I disable Telnet on Ubuntu server?

ll /etc/xinetd.d/telnet
ls: cannot access /etc/xinetd.d/telnet: No such file or directory

Ubuntu has a no open ports policy which covers the default installation.

The instructions do not work because telnet is not enabled on Ubuntu Server. You do not need to disable telnet unless you've installed a telnet daemon on your own and enabled it.

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