sudo: unable to resolve host 127.0.0.1kaushal

Question

Yes, Might be duplicate of following links Tried both links solutions but didn't worked for me.

Following is my /etc/hosts output:

127.0.0.1 kaushal
120.0.0.1 localhost.localdomain localhost
127.0.0.1 localhost.com


# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Following is my /etc/hostname output:

127.0.0.1 kaushal
120.0.0.1 localhost.localdomain localhost
127.0.0.1 localhost.com

Every time when I write command sudo apt-get update I get following error message.

sudo: unable to resolve host 127.0.0.1kaushal

Also in my terminal I get kaushal@127:~$ as following screenshot.

It was not like that before.

All this started happening after I change my username from

All Setting >  Details > Device name

Any suggestion what's wrong with my machine?? How can I resolve this problem. Let me know if you want more details.

Have you tried deleting the line 127.0.0.1 localhost.com , save changes and then reboot your machine? — Dominic Motuka, Jun 11 '16 at 20:21
Also try to interchange the lines such like : 127.0.0.1 localhost.localdomain localhost comes first then 127.0.1.1 kaushal where kaushal is your machine name. — Dominic Motuka, Jun 11 '16 at 20:32
Suthar there's a typo in 127.0.0.1 kaushal...it's supposed to be 127.0.1.1 kaushal — Dominic Motuka, Jun 11 '16 at 20:40
Maybe, I've checked my hostname file and now it has only my name. There is nothing like "127.0.0.1 kaushal" so I guess that was the problem. — Kaushal Suthar, Jun 11 '16 at 20:42
I didn't try this one "127.0.1.1 kaushal ", Check my update in question. — Kaushal Suthar, Jun 11 '16 at 20:46
Please don't put the solution in the question. Instead, edit the solution out of your question and put it in the answer space. You can then accept your own answer. — chaskes, Jun 11 '16 at 20:47
It doesn't matter (much) if the short name is associated with 127.0.0.1 or 127.0.1.1 -- the latter is a Debian/Ubuntu specific thing, where the hostname configured in the installer is added to /etc/hosts. In the good old days there was only a single entry, listing the hostname first and localhost second. — Simon Richter, Jun 11 '16 at 23:50

score 4 · Accepted Answer · edited Jun 11 '16 at 22:55

4

I solved the problem by going to
All Setting > Details > Device Name
changed the device name to kaushal
Just make sure that your /etc/hostname file has only your machine name.For my case it was kaushal

edited Jun 11 '16 at 22:55

Dominic Motuka

1,231

answered Jun 11 '16 at 20:48

Kaushal Suthar

265

Dominic Motuka · Answer 2 · 2016-06-11T20:48:19.283

1

I will answer your question specifically
In your /etc/hosts for localhost change 127.0.0.1 kaushal to
127.0.1.1 localhost localhost.localdomain kaushal

edited Jun 11 '16 at 20:48

answered Jun 11 '16 at 20:37

Dominic Motuka

1,231

sudo: unable to resolve host 127.0.0.1kaushal

2 Answers2