There are several answers on how to change hostname of Ubuntu, and all of them propose to do "the same changes" to /etc/hosts. "The same" stands for "the same as in /etc/hostanme". But unfotunately, these files have completely different formats, and they can't be changed in "same" manner.

So, the question is: what to write in hosts to have hostname myname?

Currently my hosts contains: localhost

and some IPv6 stuff which I don't understand.

So, should I replace localhost with myname, really?


Yes, really. The /etc/hosts file is just a map that links IPs to hostnames. If you want to be able to do things like ssh myname and have that run ssh localhost, you need to add a line that identifies localhost ( as myname: localhost myname

You could just replace localhost with myname, but then things like ssh localhost would fail and localhost is pretty standard. So just add another line as shown above.

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    Use just one line: ' localhost myname` – waltinator Jul 28 '17 at 14:37
  • I wouldn't use it in one line. Usually I use localhost.localdomain localhost and myserver.mydomain myserver to keep things a bit more structured – derHugo Jul 28 '17 at 17:18

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