Pi3 "unable to resolve host" message

Question

I have a message saying:"sudo: unable to resolve host (myhostname)" each time i write a command. My hostname do not contain any capital letter or number. thank you

Does /etc/hosts contain an entry like 127.0.1.1 myhostname? — joan, Apr 07 '17 at 21:11
Thank you, i added myhostname in this file and the message went disappered. — Niz.Dam, Apr 07 '17 at 22:53
I have another problem it concerns the Wifi. i can't really connect to my router, i added my connection information in /etc/wpa_supplicant/wpa_supplicant.conf and changed /etc/network/interfaces. — Niz.Dam, Apr 07 '17 at 22:57
Also, the wifi icon mentions Wlan0 " No wifi interfaces found" — Niz.Dam, Apr 07 '17 at 22:58
"changed /etc/network/interfaces" is probably your problem DO NOT MODIFY See How do I set up networking/WiFi/Static IP Also if you changed your hostname using raspi-config you would not probably have had the problem you originally posted. — Milliways, Apr 07 '17 at 23:46
raspi-config on a fresh Raspbian Lite installation did not change the /etc/hosts 127.0.1.1 raspberrypi line for me — scruss, Dec 13 '17 at 17:48

score 6 · Accepted Answer · answered Dec 13 '17 at 17:54

6

Sometimes, even if you've changed the host name via raspi-config, the settings don't stick. To make it permanent:

sudo nano /etc/hosts

and change the line that says

127.0.1.1       raspberrypi

to

127.0.1.1       myhostname

assuming that myhostname is the name you want to use. Save, exit and reboot, and the message will go away.

answered Dec 13 '17 at 17:54

scruss

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Isn't the localhost IP 127.0.0.1? – Fergara May 25 '20 at 12:41
1

It's complicated …. But this issue appears to be resolved in Raspbian. – scruss May 25 '20 at 12:51
This fixed my issue! Thanks! – LtMuffin Nov 21 '21 at 14:49

Pi3 "unable to resolve host" message

1 Answers1