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So, I installed server edition 16.04. Network manager is not installed. 

> ~$ less /etc/network/interfaces

>#auto  enp3s0
>#iface lo inet loopback 
>iface enp3s0 inet dhcp

I have tried various combinations here, but with this spesifik config i can reboot and lo still comes up. Seems that no matter what I set i etc/network/interfaceses, it is ignored and the computer brings up lo and enp3s0 on every boot.

Can anyone help?

jarle
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1 Answers1

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The loopback interface, lo, is supposed to come up. It is an integral part of the system and shouldn’t be altered or defeated.

I suggest that you amend your file to:

auto lo
iface lo inet loopback

auto enp3s0
iface enp3s0 inet dhcp

Reboot the computer and check:

ifconfig

Did you get an IP address? Can you ping?

ping -c3 www.google.com

If you get ping returns, you’re all set.

chili555
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  • Nah, it goes deper that that. I copied your suggestion for the etc/network/interfaces - file. Rebooted, and lo and enp3s0 came up working. So for the hell off it, I commented out the enp3s0 lines, and rebooted, and enp3s0 was back up ?!?. So I know lo is suppoused to be up, but my question is where are the config files controlling lo, and enp3s0 for that sake. It is obivous not the /etc/network/interfaceses file. In fact I just did a `sudo mv /etc/network/interfaces /etc/network/interfaces.notworking` Rebootet, and both interfacees are still up? – jarle Apr 24 '18 at 12:29
  • Let’s see: cat /etc/netplan/*.yaml Also: lsb_release -d – chili555 Apr 24 '18 at 12:48
  • :~$ cat /etc/netplan/01-netcfg.yaml # This file describes the network interfaces available on your system # For more information, see netplan(5). network: version: 2 renderer: networkd ethernets: enp3s0: dhcp4: yes ~$ lsb_release -d Description: Ubuntu 17.10 – jarle Apr 24 '18 at 13:16
  • Ah, haa! Not running 16.04 server edition then. By default, netplan manages interfaces in 17.10 server and later. Please see: https://askubuntu.com/questions/976464/why-is-the-network-configuration-i-set-in-etc-network-interfaces-ignored-on-ubu/976497#976497 – chili555 Apr 24 '18 at 13:28