Debian command-line cannot resolve host [closed]

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I'm having an issue where my remote command-line cannot resolve the local hostname. It doesn't show as user@localhost, user@ip or any variant, but instead as user@(none):

Using username "rogue".
rogue@<my-ip>'s password:
Linux (none) 3.13.7-x86_64-linode38 #1 SMP Tue Mar 25 12:59:48 EDT 2014 x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Apr 27 15:34:56 2014 from ---
rogue@(none):~$

Any proceeding commands cause this warning message:

rogue@(none):~$ sudo service nginx start
sudo: unable to resolve host (none)
[sudo] password for rogue:

Looking at my hosts and hostname files, I'm not seeing anything out of the ordinary:

/etc/hostname

127.0.0.1 localhost
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

/etc/hosts

127.0.0.1       localhost
127.0.1.1       debian

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

What could potentially be wrong with my network configuration? If possible, I would like that it says user@my.domain, but I need localhost to still route correctly to 127.0.0.1

Answer 1

Your /etc/hostname is very wrong. It should be plain text of FQDN, like example.com or localhost, instead of a similar copy of /etc/hosts

You may want to use command hostname to view and set hostname, man it

Answer 2

What about these commands?

hostname here.yourhost.name
sudo sed -i "s|localhost|localhost $(hostname)|g" /etc/hosts

adding hostname next to other, localhost names in /etc/hosts