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So I have a newly installed ubuntu machine. I was going to enter some network setup, but this file is missing: /etc/network/interfaces. I also checked with root. There is a local loopback on the machine. Shouldn't it be ? is it just a matter of creating it from scratch and it will be picked up automaticly on reboot ?

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You haven't told us your Ubuntu version, but I assume you have Ubuntu 18.04 or above based on your missing file.

Ubuntu 18.04 and above use netplan to configure your network, and /etc/network/interfaces does not exist anymore. The netplan configuration file should be at /etc/netplan/.

You may still switch back to using the old method (not recommended) by installing the relevant packages:

$ sudo apt update
$ sudo apt install ifupdown net-tools

If you would like to change your NICs names to the old representation, you'll need to change a grub parameters at /etc/default/grub: Change GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0". Perform $ sudo update-grub afterwords and reboot.

Any other changes regarding IP addresses, dns and other configuration methods should be the same as you know from past expirience.

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